1.

If nobjectsare arrangedin arowthen the numberof waysof selectingthreeof theseobjectsso thatnotwoof themare nextto eachother is

Answer»

`""^((n-3))C_(3)`
`""^((n-2))C_(3)`
`""^((n+3))C_(3)`
`""^((n+2))C_(3)`

ANSWER :B


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