Questions
Let be a set containing elements. The number of ways of choosing two subsetsand of such that
is
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a
2n
b
3n
c
4n - 2n
d
4n - 3n
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Correct option is B
For each x∈A, we have four choices;(i) x∈P,x∈Q(ii) x∈P,x∉Q(iii) x∉P,x∈Q(iv) x∉P,x∉QOut of these four choices, last 3 choices imply x∉P∩QThus, P and Q can be chosen in 3n ways so thatP∩Q=ϕSimilar Questions
If then equal to
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