Daily Drills 5 - Section 5 - Question 4

Supply the missing premise that makes the conclusion follow logically:P: X → not AP: not X → DP: ?C: A → C

sonson July 3, 2018

Clarification

Isn't C->D the same as notC->not?

Replies
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Christopher July 6, 2018

@sonson, no the contrapositive of C->D is not D->not C. You cannot simply reverse, and you cannot simply negate. You've got to do both.

sonson July 7, 2018

Perfect thanks