If a_1,a_2, a_ 50 are in GP, then a_1-a_3+a_5- +a_ 49 a_2-a_4+a_6- +a_ 50 is equal to

JEE Main Mathematics question

If are in GP, then is equal to

Answer: (C)

With ratio , the denominator is . The bracket equals the

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Question ID VK-021484