The number of euivalence realtion

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The number of euivalence realtion on set {1,2,3,4} is
a) 15 b)16
c)24 d)4

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    Prateek Gupta (anonymous)

    a

    Prateek Gupta answered
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      Aniruddha Chaudhari (anonymous)

      16 ?

      Aniruddha Chaudhari answered
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        Akshay Chimote (anonymous)

        15

        Akshay Chimote answered
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          Ankit Chauhan (anonymous)

          for n element set it is nth bell number

          Ankit Chauhan answered
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            Ankit Chauhan (anonymous)

            http://www-history.mcs.st-and.ac.uk/Miscellaneous/StirlingBell/bell.html

            Ankit Chauhan answered
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