Q. 133.8( 5 Votes )

If n(X) = m, n(Y) A. m + n + p

B. m + n – p

C. m – p

D. m – n + p

Answer :

Given


n(X) = m, n(Y) = n and n(X Y) = p


n(X Y) = ?


we know that n(A B) = n(A) + n(B) - n(A B)


in the same way, n(X Y) = n(X) + n(Y) - n(X Y)


n(X Y) = m + n – p


option B is the correct answer.

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