Q. 54.2( 42 Votes )

# If X and Y

Answer :

Given-

n(X) = 40, n(X Y) = 10, and n(X Y) = 60

We know that-

n(X Y) = n(X)+ n(Y) - n(X Y)

60 = 40+n(Y) - 10

60 = 30+n(Y)

n(Y) = 60-30

n(Y) = 30

Thus, the no. of elements in n(Y) is 30.

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