Q. 23.7( 6 Votes )

If P and Q are tw

Answer :

Given:


n(P) = 40


n (P Q) = 60


n (P Q) =10


n(Q) = ?


We know,


n (P Q) = n(P) + n(Q) – n (P Q)


Substituting the values we get


60 = 40+n(Q)–10


60 = 30+ n(Q)


n(Q) =30


Q =has 30 elements.


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