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Given that n is odd, number of ways in w...

Given that n is odd, number of ways in which three numbers in AP can be selected from 1, 2, 3,……., n, is

A

`(n-1)^2/2`

B

`(n+1)^2/2`

C

`(n^2-1)/4`

D

`(n-1)^2/4`

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