If X=4n−3n−1:n∈N and Y={9(n−1):n∈N} where N is the set of natural numbers, then X∪Y is equal to

If X=4n3n1:nN and Y={9(n1):nN} where N is the set of natural numbers, then XY is equal to

  1. A

    X

  2. B

    Y

  3. C

    N

  4. D

    Y-X

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    Solution:

    Clearly X={0,9,54,243,} and Y={0,9,18,27,}XY=Y

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