Q.

If a Set -A have 12 elements, then the number of subsets of A having atleast 3 elements is

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a

4017

b

4027

c

4067

d

4087

answer is A.

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Detailed Solution

=12c3+12c4+−−−−+12c12 =(2)12−12c0−12c1−12c2 =4017
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