SOLUTION: ~P->~D ~D->~F ~P∴~F

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Question 1071617: ~P->~D
~D->~F
~P∴~F
Answer by math_helper(2461) About Me  (Show Source):
You can put this solution on YOUR website!
~P->~D
~D->~F
~P∴~F
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1. ~P->~D    Premise

2. ~D->~F    Premise 

3. ~P        Premise

4. ~D        1,3  CE ( Conditional Elimination )

5. ~F        2,4  CE, proof complete  

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