1.

Which of the following is NOT true e?

Answer»

`{(PTOQ)^^(qtor)}to(ptor)` is a TAUTOLOGY
`(p^^~q)harr(ptoq)` is a tautology
`~(PHARRQ)-=(p^^~q)vv(~p^^q)`
`pto(q^^r)-=(ptoq)^^(ptor)`

ANSWER :C


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