Let a_ 1 , a_ 2 , a_ 3 , _____ be an A.P. If _ r=1 ^ a_ r /2^ r = 4, then 4a_ 2 is equal to _____.

JEE Main 2022 Mathematics question

Let , , , be an A.P. If , then is equal to .

Answer: 16

Let + …. Then S/2 = + …, and subtracting: S/2 = $/2

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Question ID VK-035159