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Number of ways in which three numbers in...

Number of ways in which three numbers in AP 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 odd

C

`((n -1)^(2))/(4)` if n is odd

D

`(n(n -2))/(4)` if n is even

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The correct Answer is:
C, D
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