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Q1. If X and Y are two sets such that n ( X ) = 17, n ( Y ) = 23 and n ( X Y ) = 38, find n ( X
Y ).
Answers (1)
n( X ) = 17, n( Y ) = 23 and n( X Y ) = 38
n( X Y ) = n( X ) + n( Y ) - n ( X
Y )
38 = 17 + 23 - n ( X Y )
n ( X Y ) = 40 - 38
n ( X Y ) = 2.
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