Using universal modus tollens, fill
in the following
- People who are good at logic make good programmers.
Buffy would not be a good programmer.
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- My professors are happy when I pay close attention to their lectures.
_________________________________________________
My professors are
not happy today.
- x, k Z,
if x = 2k for some integer k, then
x is even.
x is not even.
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- Animals at the bottom of the food chain are very nervous.
_________________________________________________
Lions are not
at the bottom of the food chain.