Question

Q.9 If A and B are two sets such that
n(A) = 40, n(AUB) = 60 and no. of
elements of both A and B = 10: Then
n(B) =​

Answer 1

Answer:30

Step-by-step explanation: n(a u b)=n(a) + n(b)-n(a intersection b)

60= 40 + n(b)  - 10

60= 30 +n(b)

60 - 30 = n(b)

30 =n(b)