If two sets \( A \) and \( B \) have 99 elements in common, then the number of elements common t....

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If two sets \( A \) and \( B \) have 99 elements in common,
\( \mathrm{P} \)
then the number of elements common to each of
W
the sets \( \mathrm{A} \times \mathrm{B} \) and \( \mathrm{B} \times \mathrm{A} \) are
(1) \( 2^{99} \)
(2) \( 99^{2} \)
(3) 100
(4) 18


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