Q.

A set contains (2n + 1)  elements. The number of subsets of the set which contain at most 'n'  elements is

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a

2n

b

n2

c

2n2

d

22n

answer is D.

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Detailed Solution

=2n+1c0+2n+1c1+−−−−+2n+1cn =12(2n+1c0+2n+1c1+−−−−+2n+1c2n+1) =12.22n+1=22n
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