Question

If n (A) = 30, n(A U B) = 50, n (A ꓵ) B = 12, then n (B) = ______________.
12
42
30
32​

Answer 1

Answer:

given,

n(A)=30

n(A U B)=50

n (A ꓵ) B =12

n(B)=?

n(A U B)=n(A)+n(B)- n (A ꓵ) B

50=30+n(B) -12

50=18+n(B)

50-18=n(B)

n(B)=32