Questions
If of three subsets (i.e., subsets containing exactly three elements) of the set
contain then value of is
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a
15
b
16
c
17
d
18
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Correct option is A
The number of subsets of A containing exactlythree elements is nC3 whereas the number of three subsetsof A that contain a1 is n−1C2 we are given. n−1C2=20100 nC3⇒(n−1)(n−2)2=15n(n−1)(n−2)(6)⇒n=15.Similar Questions
is equal to
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