{"id":2496,"date":"2021-10-01T07:09:26","date_gmt":"2021-10-01T07:09:26","guid":{"rendered":"http:\/\/stgwebsite.mindspark.in\/wordpress\/?page_id=2496"},"modified":"2022-01-02T06:30:09","modified_gmt":"2022-01-02T06:30:09","slug":"nth-term-of-a-geometric-progression","status":"publish","type":"page","link":"https:\/\/stgwebsite.mindspark.in\/studymaterial\/math-concepts\/nth-term-of-a-geometric-progression\/","title":{"rendered":"nth term of a Geometric Progression"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; admin_label=&#8221;Section&#8221; module_class=&#8221;mainsec&#8221; _builder_version=&#8221;4.10.4&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#e0f2fd&#8221; z_index=&#8221;1&#8243; custom_padding=&#8221;5px||5px||true|false&#8221; locked=&#8221;off&#8221; collapsed=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row column_structure=&#8221;3_5,2_5&#8243; custom_padding_last_edited=&#8221;on|phone&#8221; _builder_version=&#8221;4.10.8&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#FFFFFF&#8221; width=&#8221;100%&#8221; max_width=&#8221;1310px&#8221; custom_padding=&#8221;|51px|40px|51px|false|true&#8221; custom_padding_tablet=&#8221;&#8221; custom_padding_phone=&#8221;|40px|30px|40px|false|true&#8221; border_radii=&#8221;on|10px|10px|10px|10px&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;3_5&#8243; admin_label=&#8221;Column L&#8221; _builder_version=&#8221;4.9.10&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;Acute Angles<br \/>\n&#8221; _builder_version=&#8221;4.10.8&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_font_size=&#8221;50px&#8221; header_line_height=&#8221;1.18em&#8221; custom_padding=&#8221;|0px||4px|false|false&#8221; header_font_size_tablet=&#8221;&#8221; header_font_size_phone=&#8221;35px&#8221; header_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1><strong>nth term of a Geometric Progression<\/strong><\/h1>\n<p>[\/et_pb_text][et_pb_text admin_label=&#8221;Text&#8221; _builder_version=&#8221;4.11.3&#8243; _module_preset=&#8221;default&#8221; text_font_size=&#8221;16px&#8221; header_2_font=&#8221;|600|||||||&#8221; header_2_text_color=&#8221;#a01414&#8243; header_3_font=&#8221;|600|||||||&#8221; header_3_text_color=&#8221;#777777&#8243; custom_padding=&#8221;15px|15px||4px|false|false&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2><strong>n<sup style=\"font-size: 10px;\">th<\/sup>\u00a0term of a Geometric Progression<\/strong><\/h2>\n<p>The series in which the ratio between any two consecutive numbers is the same is known as geometric progression. For example, consider a series containing the terms 1, 2, 4, 8, 16, and so on. The ratio of any two consecutive numbers i.e <span style=\"font-weight: 400;\"><span class=\"katex-eq\" data-katex-display=\"false\">\\frac{2}{1} = \\frac{4}{2} = \\frac{16}{8} = 2<\/span><\/span><\/p>\n<p>So, a geometric progression can be expressed in the form of <span style=\"font-weight: 400;\">a, ar, ar\u00b2, ar\u00b3, ar<sup style=\"font-size: 10px;\">4<\/sup>\u2026\u2026ar<sup style=\"font-size: 10px;\">n-1<\/sup><\/span><\/p>\n<p>Where a = the first term<\/p>\n<p>r = common ratio<\/p>\n<p>Now let us learn how to find the <span style=\"font-weight: 400;\">n<sup style=\"font-size: 10px;\">th<\/sup><\/span> term in a geometric progression.<\/p>\n<h2><strong>Formula for the n<sup style=\"font-size: 10px;\">th<\/sup>\u00a0term of a Geometric Progression<\/strong><\/h2>\n<p>Consider a geometric progression having the terms 5, 15, 45, 135, 405, and 1215.<\/p>\n<p>The first term is 5 and the common ratio of the above series is 3.<\/p>\n<p>&nbsp;<\/p>\n<p>Now, we can write the different terms in the above series as below.<\/p>\n<p>T<sub>1 <\/sub>= 5\u00a0 = a<\/p>\n<p>T<sub>2<\/sub> = 15 = 5X3 = ar<\/p>\n<p>T<sub>3<\/sub> = 45 = 5X3<sup>2<\/sup> = ar<sup>2<\/sup><\/p>\n<p><sup>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/sup>T<sub>4<\/sub> = 135 = 5X3<sup>3<\/sup> = ar<sup>3<\/sup><\/p>\n<p>&nbsp;<\/p>\n<p>Can you spot the pattern here? The pattern that is emerging is that the <span style=\"font-weight: 400;\">n<sup style=\"font-size: 10px;\">th<\/sup><\/span> term in a geometric progression is the product of the first term and the common ratio raised to (n-1).<\/p>\n<p>&nbsp;<\/p>\n<p>So, the formula to calculate the <span style=\"font-weight: 400;\">n<sup style=\"font-size: 10px;\">th<\/sup><\/span><sup>\u00a0<\/sup>term of a GP is T<sub>n<\/sub> = ar<sup>n-1<\/sup><\/p>\n<p>&nbsp;<\/p>\n<h2><\/h2>\n<h2><\/h2>\n<h3><strong>Solved Examples:<\/strong><\/h3>\n<ol>\n<li>If 5, 20, 80, 320\u2026 is a geometric progression, find the <span style=\"font-weight: 400;\">7<sup style=\"font-size: 10px;\">th<\/sup><\/span> term of the series.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><strong>Solution:<\/strong><\/p>\n<p>From the given question, we know that the first term a = 5 and the common ratio r =20\/5=4<\/p>\n<p>The formula to calculate the <span style=\"font-weight: 400;\">n<sup style=\"font-size: 10px;\">th<\/sup><\/span> term of a geometric progression is T<sub>n<\/sub> = ar<sup>n-1<\/sup><\/p>\n<p>T<sub>7<\/sub>\u00a0 =5 \u2715 4<sup>6<\/sup><\/p>\n<p>T<sub>7<\/sub>\u00a0 =5 \u2715 4,096<\/p>\n<p>T\u00a0 =20,480<\/p>\n<ol start=\"2\">\n<li>If the 3<sup>rd<\/sup> term and 5<sup>th<\/sup> term of a GP are 40 and 160, find the 8<sup>th<\/sup> term of the GP.<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><strong>Solution:<\/strong><\/p>\n<p><strong>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/strong>We know that the n<sup>th<\/sup> term of a geometric progression can be expressed as T<sub>n<\/sub> = ar<sup>n-1<\/sup><\/p>\n<p>&nbsp;<\/p>\n<p>So, T<sub>3<\/sub> = 40 =\u00a0 ar<sup>3-1<\/sup> and<\/p>\n<p>T<sub>5<\/sub> = 160 = ar<sup>5-1<\/sup><\/p>\n<p>40 = ar<sup>2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/sup>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (1)<\/p>\n<p>160 = ar<sup>4<\/sup>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 (2)<\/p>\n<p>Now, dividing (2) by (1), we get<\/p>\n<p>4 = r<sup>2<\/sup><\/p>\n<p>r = \u221a4<\/p>\n<p>r = 2.<\/p>\n<p>Substituting r = 2 in (1), we get<\/p>\n<p>40 = ax2<sup>2<\/sup><\/p>\n<p>a = 10.<\/p>\n<p>To find the 8<sup>th<\/sup> term of the GP, we can use the formula\u00a0 T<sub>n<\/sub> = ar<sup>n-1<\/sup><\/p>\n<p>T<sub>8<\/sub> = 10 x 2<sup>8-1<\/sup><\/p>\n<p>`T<sub>8<\/sub> = 10 x 128<\/p>\n<p>T<sub>8<\/sub> = 1280.<\/p>\n<p>&nbsp;<\/p>\n<ol start=\"3\">\n<li>How many terms are there in a GP containing the terms 3, 6, 12, \u2026.. 192?<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><strong>Solution:<\/strong><\/p>\n<p>In the given question, a= 3 and r =6\/3=2. \u00a0and the last term is 192.<\/p>\n<p>We know the <span style=\"font-weight: 400;\">n<sup style=\"font-size: 10px;\">th<\/sup><\/span> term of a GP is T<sub>n<\/sub> = ar<sup>n-1<\/sup><\/p>\n<p>In the given question, T<sub>n<\/sub> = 192 = 3 x 2<sup>n-1<\/sup><\/p>\n<p>64= 2<sup>n-1<\/sup> = 2<sup>6<\/sup><\/p>\n<p>n = 6+1 = 7.<\/p>\n<p>Hence, there are 7 terms in the given GP series.<\/p>\n<p>&nbsp;<\/p>\n<p>[\/et_pb_text][\/et_pb_column][et_pb_column type=&#8221;2_5&#8243; 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_module_preset=&#8221;default&#8221; width=&#8221;100%&#8221; max_width=&#8221;1310px&#8221; custom_padding=&#8221;|40px||40px|false|true&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.9.11&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text admin_label=&#8221;FAQ&#8221; module_class=&#8221;faqstyl&#8221; _builder_version=&#8221;4.11.3&#8243; _module_preset=&#8221;default&#8221; text_font_size=&#8221;16px&#8221; header_font=&#8221;|700|||||||&#8221; header_text_align=&#8221;center&#8221; header_line_height=&#8221;2.5em&#8221; background_color=&#8221;#dbedc6&#8243; max_width=&#8221;80%&#8221; module_alignment=&#8221;center&#8221; custom_margin=&#8221;||||false|false&#8221; custom_padding=&#8221;30px|25px|30px|25px|true|true&#8221; border_radii=&#8221;on|10px|10px|10px|10px&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h1>Frequently Asked Questions<span style=\"font-weight: 400;\">\u00a0<\/span><\/h1>\n<p><strong>1. How to calculate the sum of a GP series?<\/strong><\/p>\n<p><strong>Ans<\/strong> We can calculate the sum of a geometric progression series using the following formulas:<\/p>\n<p>S = (a (1- r^n\u00a0 ))\/(1-r) ( where r &lt;1)<\/p>\n<p>When r &gt;1, S = (a ( r^n-1 ))\/(r-1)<\/p>\n<p>&nbsp;<\/p>\n<ol start=\"2\">\n<li><strong>How to calculate the sum of an infinite GP series?<\/strong><\/li>\n<\/ol>\n<p><strong>Ans<\/strong> The sum of an infinite GP series is calculated using the formula S = (a (1- r^n\u00a0 ))\/(1-r) \u00a0where |r| &lt;1 .<\/p>\n<p>&nbsp;<\/p>\n<ol start=\"3\">\n<li><strong>How to find the value of r in a GP?<\/strong><\/li>\n<\/ol>\n<p><strong>Ans<\/strong>: r is the common ratio of any two consecutive numbers in a GP series. The value of r is constant in any given geometric progression. The value of r can be calculated using the formula Tn\/(Tn-1). We can also obtain the value of r by dividing any term in the GP by its preceding term.<\/p>\n<p>&nbsp;<\/p>\n<ol start=\"4\">\n<li><strong>How to calculate the number of terms in a GP?<\/strong><\/li>\n<\/ol>\n<p><strong>Ans<\/strong>: Where the first term, common ratio, and the last term of a geometric progression are given, we can find the number of terms in the given GP by substituting the given values in the formula\u00a0 T<sub>n<\/sub> = ar<sup>n-1<\/sup> and solving for n.<\/p>\n<p>\u200b<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Numbers can be expressed in words and we call them number names. The numbers starting from 1 to 20 are written with specific spellings followed by a generic pattern.  The nth term of a Geometric Progression is Tn = arn-1. Common ratio = r = TnTn-1. The general form of a GP is a, ar, ar2, ar3, ar4\u2026\u2026arn-1<\/p>\n","protected":false},"author":7,"featured_media":0,"parent":714,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>nth term of a Geometric Progression - mydomain<\/title>\n<meta name=\"description\" content=\"The nth term of a Geometric Progression is Tn = arn-1. Common ratio = r = Tn\/(Tn-1). 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