Question

if A and B are two disjoint sets and n(A)=15 and n(B)= 10 find n(A intersection B ) and (A union B)

Answer 1

n(A intersection B) =0, because A and B are two disjoint sets.

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

n(AUB) =15+10

n(AUB) =25

Ans : n(A intersection B) =0.

n(AUB)= 25.