PDF chapter test TRY NOW

1. If n(A) = 25, n(B) = 40, n(A \cup B) = 50 and n(B') = 25, find n(A \cap B) and n(U).
 
n(A \cap B) =
 
n(U) =
 
 
2. If n(A) = 300, n(A \cup B) = 500, n(A \cap B) = 50 and n(B') = 350, n(B) and n(U).
 
n(B) =
 
n(U) =