Question

if a and b are 2 sets such that n(a)=15, n(b)=12 and n(a union b)= 21, then what is n(a intersection b)​

Answer 1

Answer:

(A)=15, n(B)=12 & n(AUB)=21

Step-by-step explanation:

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

36=15+12-n(AnB)

n(AnB)= 15+12- 21

n(AnB)= 27- 21

= 6