Question

if n(A)=36 n(A UNION B)=46 n(A INTERSECTION B) =15 then n(A-B) is equal to ??

Answer 1

Answer:

21

n(A-B) = in A but NOT in B

n( A-B) = n(A)- n(A intersection B)

n( A-B) = 36 -15 = 21