Question

If n(A) = 10, n(B) = 5 and A u B = A, then write the number of element In A-B​

Answer 1

Answer:

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

by solving we get n(B)=n(AnB)

n(A)=10,n(B)=n(AnB)=5

SO n(A)-n(B) is 5..

Step-by-step explanation: