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The number of all three elements subsets...

The number of all three elements subsets of the set `{a_1, a_2, a_3 ….a_n}` which contain `a_3` is

A

`""^nC_3`

B

`""^(n-1) C_3`

C

`""^(n-1)C_2`

D

none of these

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The correct Answer is:
C
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