If either X or Y is true, and X is false, what can we conclude about Y?

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Multiple Choice

If either X or Y is true, and X is false, what can we conclude about Y?

Explanation:
Disjunction means at least one of the statements is true. If X is false and X or Y is true, the only way the OR can hold is that Y is true; otherwise, both X and Y would be false and the OR would be false. So Y must be true.

Disjunction means at least one of the statements is true. If X is false and X or Y is true, the only way the OR can hold is that Y is true; otherwise, both X and Y would be false and the OR would be false. So Y must be true.

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