If two sets A and B are having 99 elements in common, then the number of elements common to each of the sets A x B and B x A are

# If two sets $A$ and $B$ are having 99 elements in common, then the number of elements common to each of the sets  and are

1. A

${2}^{99}$

2. B

${99}^{2}$

3. C

100

4. D

18

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