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The number of ways of selecting ' n ' th...

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 :

A

`n2^(n-1)`

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
D
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