Question

(4). If n(A) = n(A U B) =29,n(A^B) then find n(B)​

Answer 1

Step-by-step explanation:

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if n(A)=15, n(AUB)=29,n(A^B)=7, n(B)=?

n(AUB)=n(A)+n(B)-n(A^B)

29=15+n(B)-7

29=8+n(B)

29-8= n(B)

i.e n(B)=21