alleryIf A then B; if C then D; if E then F. At least one of A,C,E occurs. Neither B nor D occurs. Which must be true?
ANeither E nor F occurs
BE occurs but F does not
CBoth E and F occur
DF occurs but E does not
Answer & Solution
Correct answer: C. Both E and F occur
Not B rules out A and not D rules out C, so the stated alternative forces E, which in turn forces F.
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