Question: If event X cannot occur unless event Y occurs first then: a) Y is necessary for X b) X is necessary for Y c) X

If event X cannot occur unless event Y occurs first then:

If event X cannot occur unless event Y occurs first then: a) Y is necessary for X b) X is necessary for Y c) X is both necessary and sufficient for Y d) X and Y are the same event c) X is both necessary and sufficient for Y a) Y is necessary for X b) X is necessary for Y d) X and Y are the same event

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