If the 5^ th term of an AP is 1 10 and its 10^ th term is 1 5 , then what is the sum of first 50 terms?

NDA 2022 Mathematics question

If the 5 term of an AP is and its 10 term is , then what is the sum of first 50 terms?

Answer: (B)

and . Subtracting: , and $a =

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Question ID VK-029343