1.

Which of the following statements is not a tautology?

Answer»

`(p^^q ^^R)RARR (~pvv ~q vv r)`
`(p^^q ^^r) rArr ((~p^^~q)VVR)`
`(p^^~q ^^r) rArr (~pvv q vv r)`
`(p^^ q ^^ ~r) rArr r`

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