Question

if n(U)= 20, n(A)= 12, n(B)= 11 and n(A U B)' = 7, find n(A n B).


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Answer 1

Step-by-step explanation:

n(U) = 20

n(A UB)' = 7

n(AUB)= n(U)-n(A U B)'

= 20-7 = 13

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

13 = 12 + 11 -x

x=23-13=10