Time remaining:
Which derivation rule justifies the following argument?

Mathematics
Tutor: None Selected Time limit: 0 Hours

Apr 7th, 2015

The answer wood be c based upon what modus tollens actually states. Modus tollens states that if  one thing p being true implies that another thing q is true as well but q actually is false then p must not be true either 

Apr 9th, 2015

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Apr 7th, 2015
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