1.

The number of ways of selecting ' n ' things out of '3n ' things of which 'n ' are of one kind and alike and 'n ' are of second kind and alike and the rest unlike is :

Answer»

`N2^(n-1)`
`(n-1)2^(n-1)`
`(n+1)2^(n-1)`
`(n+2)2^(n-1)`

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