Question

lets a and b be two sets such that n(a) =5 n (aUb)=9,n (b)=2 find n(b)=?​

Answer 1

Step-by-step explanation:

It is a wrong question ❌

Answer 2

Answer:

n(B)= 4

because n(A) is 5 and n(AUB)is 9, remaining n(B)=4

hope my answer was correct