P: Y → ZP: not A → not ZP: A → CC: ?

Julian June 14, 2016

I don't understand!!!:'(

Who can explain, how determine the what's exactly is conclusion?????

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Mehran July 5, 2016

@Julian, this drill is testing the transitive property.

We can combine these principles as follows:

Y ==> Z ==> A ==> C

Contrapostive:

not C ==> not A ==> not Z ==> not Y

So our conclusion here is:

Y ==> C
not C ==> not Y

Hope this helps! For a more in-depth review of these concepts, please watch our lesson on Sufficient & Necessary Conditions.