Question

4. Given xay and when x= 15, y = 3, find 1. y when x=3​

Answer 1

Answer:

It is given that:

n(X)=17,n(Y)=23,n(X∪Y)=38

n(X∩Y)=?

Using the formula

n(X∪Y)=n(X)+n(Y)−n(X∩Y)

∴38=17+23−n(X∩Y)

⇒n(X∩Y)=40−38=2

∴n(X∩Y)=2