If X and Y are any sets, which of the following exactly expresses what it means for XSY to be false? O There is an element in X that is not in Y. O No element in Y is in X. O There is an element in Y that is not in X. O No element in X is in Y. Let A = {n €Z |n = 5r for some integer r} and B = {m eZ|m = 20s for some integer s}. Determine which of the following statements are true and which are false. (Enter TRUE if the statement is true, and enter a number that could be used as the basis for a counterexample if the statement is false). (a) ACB- (b) BCA-

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