Question

If n(a)=4,n(b)=5,n(u)=7 and n(a intersection b)=2 then find the value of n(a union b )'

Answer 1

Step-by-step explanation:

we have a formulae that

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

n(AUB)=4+5-2

n(AUB)= 7

hope it helps you friend