Question

If X and Y are two sets such that n(X ∪ Y) = 50, n(X) = 28 and n(X ∩ Y) = 8, then find n(Y).​

Answer 1

Answer:

formula = {n(X U Y) = N(X) + n(y )—n(XnY)

so

50=28+n(y) –8

50=20+n(y)

50–20=n(y)

30=n(y)