Questions
If two sets A and B are having 99 elements in common, then the number of elements common to each of the sets
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a
299
b
992
c
100
d
18
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Correct option is B
n((A×B)∩(B×A))=n((A∩B)×(B∩A))=n(A∩B)⋅n(B∩A)=n(A∩B)⋅n(A∩B)=(99)(99)=992Similar Questions
If P, Q and R are subsets of a set A, then
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