JEE-Advanced 2015 (22/40)

Algebra Level 3

Suppose that all the terms of an arithmetic progression (A.P.) are natural numbers. If the ratio of the sum of the first seven terms to the sum of the first eleven terms is 6:11 and the seventh term lies in between 130 and 140, then find the common difference of this A.P.


The answer is 9.

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Sandeep Bhardwaj by Sandeep Bhardwaj , 28, India

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1 solution

Akash Deep
Jun 22, 2015

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