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kristinsmith04 October 16, 2019

How do you negate a suff/necessary statement like answer choice e?

In my head: PMC> not PC NEGATED is Not PMC > PC However, an explanation by a previous instructor doesn't negate this way, unless I have misread. Cheers and thanks!

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Irina October 16, 2019

@kristinsmith04,

A contrapositive of this statement would be:

PC -> ~PMC

kristinsmith04 October 17, 2019

What does the ~ symbol mean?

Skylar October 20, 2019

@kristensmith04 The ~ symbol means "not." Just like the - symbol, it's another way to write this.