TS ICET 24 May 2019 Shift 1 Paper

Question : 113 of 200

Marks: +1, -0

Let A, B be subsets of a set Xand let n(A) denote the number of elements ill A. If n(A) = 15, n(A ∩ B) = 4, n(A ∪ B) = 21 then = n (B - A) =

Solution:

n(B-A)=n(A ∪ B)-n(A)

=21-15=6

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