If A=x:x=n2,n=1,2,3, then number of proper subsets is

If A=x:x=n2,n=1,2,3, then number of proper subsets is

  1. A

    3

  2. B

    8

  3. C

    7

  4. D

    None of these

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    Solution:

    Given that, A=x:x=n2,n=1,2,3={1,4,9}

     Number of elements in A is 3.

    So, number of proper subsets =231=7

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