In an AP, S_p=q, S_q=p and S_r denotes the sum of the first r terms. Then S_ p+q is equal to

JEE Advanced Mathematics question

In an AP, and denotes the sum of the first terms. Then is equal to

Answer: (B)

Write . Then and . Subtracting,

-+B(p-q)=

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Question ID VK-107810