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 A x B and B x A are 

  1. A

    299

  2. B

    992

  3. C

    100

  4. D

    18

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    Solution:

    n[(A x B)  (B x A)]= n[(A B) x (B A)]  =  n(A B) x n(B A) = 99 x 99 = 992

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