Question

1) If n(AUB) = 120, n(A) = 70, n(ANB) = 30 find n(B).​

Answer 1

Answer:

80

Step-by-step explanation:

given n(aUb)=120,n(a)=70,n(anb)=30

since

n(aUb)=n(a)+n(b)-n(anb)

120=70+n(b)-30

120=40+n(b)

120-40=n(b)

80=n(b)