Let n=27. Let the number of ways of selecting three numbers from 1,2,3, ,n in A.P. be p^2 then find p.

JEE Main Mathematics question

Let . Let the number of ways of selecting three numbers from in A.P. be then find .

Answer: 13

A three-term A.P. from (as an unordered selection) is fixed by its first and third terms, which must have the same

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Question ID VK-020864