1.

If n, (n > 5) things are arranged in a circular order, the number of ways of selecting three of the things so that no two of which are next to each other is

Answer»

`N(n-2)(n-3)`
`1/6 n(n-4)(n-5)`
`1/3 (n^2 +3n-5)`
NONE of these

Answer :B


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