Find the 20th and nthterms of | Class 11 Mathematics Chapter Sequence and Series, Sequence and Series NCERT Solutions

Question:

Find the 20th and nthterms of the G.P. $5 over 2 comma 5 over 4 comma 5 over 8 comma...$

Answer:

Here, a = First Term = $5 over 2$

r = common ratio = $fraction numerator begin display style 5 over 4 end style over denominator begin display style 5 over 2 end style end fraction equals 1 half$

$a subscript 20 space space end subscript equals space a r to the power of 20 minus 1 end exponent equals 5 over 2 open parentheses 1 half close parentheses to the power of 19 equals fraction numerator 5 over denominator open parentheses 2 close parentheses open parentheses 2 close parentheses to the power of 19 end fraction equals 5 over open parentheses 2 close parentheses to the power of 20 a subscript n space equals space a r to the power of n minus 1 end exponent equals 5 over 2 open parentheses 1 half close parentheses to the power of n minus 1 end exponent equals fraction numerator 5 over denominator open parentheses 2 close parentheses open parentheses 2 close parentheses to the power of n minus 1 end exponent end fraction equals 5 over open parentheses 2 close parentheses to the power of n$

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Read the question carefully and focus on the core concept being asked.
Reference examples and data from the chapter when answering questions about Sequence and Series.
Review previous year question papers to get an idea of how such questions may be framed in exams.
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Comments

Hari singh
2020-07-11 19:52:42

Hello I want to appreciate your efforts.ð This is a platform where you can easily access study materialsð I Love the solutions and answersð

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Welcome to the NCERT Solutions for Class 11 Mathematics - Chapter . This page offers a step-by-step solution to the specific question from Excercise 3 , Question 1: Find the 20th and nthterms of the G.P.....

Find the 20th and nthterms of | Class 11 Mathematics Chapter Sequence and Series, Sequence and Series NCERT Solutions

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