Question

30. ( XY)=3, n( YX) = 10 and n(XU Y) = 25, then find n(XX Y).​

Answer 1

Answer:

It is given that,
n(X)=40
n(X∪Y)=60
n(X∩Y)=10
We know that
n(X∪Y)=n(X)+n(Y)–n(X∩Y)
∴60=40+n(Y)–10
∴n(Y)=60–(40–10)=30
Thus, the set Y has 30 elementselements

Step-by-step explanation: