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Question: discrete maths 1214 use modus ponens or modus tollens to...

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discrete maths 1214:--     Use modus ponens or modus tollens to fill in the blanks in the arguments so as to produce valid inferences.   Indicate if you applied modus ponens or modus tollens to produce the valid inference (2 pts).

a) If Bob was unsure of the time of the class, then he would have checked Moodle.
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∴ Bob was sure of the time of the class.
b) If integer n is less than every positive integer, then it is less than or equal to zero.
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∴ Integer n is less than or equal to zero.

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