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There are 2n things out of which n are a...

There are 2n things out of which n are alike and n different. The number of ways of selecting n things is

A

`2^n`

B

`"^(2n)C_n`

C

`2^n-1`

D

`2^n ("^(2n)C_n)`

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The correct Answer is:
A
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