A set contains $(2n + 1)$ elements. The number of sub-sets of the set which contains at most $n$ elements is :-
A set contains $(2n + 1)$ elements. The number of sub-sets of the set which contains at most $n$ elements is :-
- A
$2^{n-1}$
- B
$2^{n+1}$
- C
$2^{2n}$
- D
$2^n$
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