Question

If the sum of an infinite GP a, ar, ar² , ar³ ,... is 15 and the sum of the squares of its each term is 150, then the sum of ar² , ar⁴ , ar⁶ , ... is :

(1) 5/2

(2) 1/2

(3) 25/2

(4) 9/2

Answer 1

Correct answer is: (2) 1/2

Sum of infinite terms :

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