Number of ways in which three numbers in...

Number of ways in which three numbers in A.P. can be selected from `1,2,3,..., n` is a. `((n-1)/2)^2` if `n` is even b. `n(n-2)/4` if `n` is even c. `(n-1)^2/4` if `n` is odd d. none of these

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