1.

Let X and Y be finite sets and f: X → Y be a function. Which one of the following statements in TRUE?

A. For any subsets A and B of X, |f (A ∪ B)| = |f(A)| + |F(B)|
B. For any subsets A and B of X, f(A ∩ B) = f(A) ∩ f(B)
C. For any subsets A and B of X, |g(A ∩ B)| = min{|f(A)|, |f(B)|}
D. For any subset S and T of Y, F-1(S∪ T) = f-1(S)∩ f-1(T)
Answer» E.


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