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There are 31 in a bag is which 10 are id...

There are 31 in a bag is which 10 are identical, then then the number of ways of choosing 10 objects from bag is

A

`2^(20)-1`

B

`2^(21)`

C

`2^(20)`

D

`2^(20)+1`

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The correct Answer is:
D
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