Question

if x and y are two sets such that n(x)=40 n (xuy)=60 n (xny)=10 *find n (y)*=?​

Answer 1

Answer:

Step-by-step explanation:

n(xuy)=n(x)+n(y)-n(xny)

60=40+n(y)-10

n(y)=60+10-40

n(y)=30