Q.
If two sets A and B are having 99 elements in common, then the number of elements common to each of the sets A×B and B×A are
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a
299
b
992
c
100
d
18
answer is B.
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Detailed Solution
nA×B∩B×A=nA∩B×B∩A=nA∩B.nB∩A=nA∩B.A∩B=9999=992.
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