Let A and B be two finite sets such that n(A – B) = 30, n (A B) = 180, n(A B) = 60, find n(B).
Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM
n(A B) = n(A – B) + n(A B) + n(B – A)
180 = 30 + 60 + n(B – A)
n(B – A) = 90
Now, n(B) = n(B – A) + n(A B)
n(B) = 90 + 60 = 150
Answered by | 4th Jun, 2014, 03:23: PM
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