 
			 
			MCQOPTIONS
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				| 1. | When to proof P Q true, we proof P false, that type of proof is known as ___________ | 
| A. | Direct proof | 
| B. | Contrapositive proofs | 
| C. | Vacuous proof | 
| D. | Mathematical Induction | 
| Answer» D. Mathematical Induction | |