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Which of the following is always true...

Which of the following is always true

A

` p ^^ (q vv r) cong (p ^^ q) ^^ r`

B

` ~ (p ^^ q) cong ~p ^^ ~q`

C

`~(p tp q) cong ~p ^^ ~q`

D

`~(p to q) cong p ^^ ~q`

Text Solution

Verified by Experts

The correct Answer is:
C
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