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I need help with this quick pls , please solve 5a​

I need help with this quick pls , please solve 5a​-example-1

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Answer:

Explanation:

If you use de morgan's laws to write out
-(PvQ), it returns -P ^ -Q

And if ^ means 'and', it is showing that (P and Q) and (-P and -Q) which isn't possible since there can't be something that is both true and false. Therefore, it is a contradiction since something can not be true a nd false at the same time.

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