Write the dual of each of the following ...

Write the dual of each of the following :
(1) `pvv(q^^r)` (2) `(p^^q)vv(~q)` (3) `~p^^(qvvc)`.

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The correct Answer is:

(1) `p^^(qvvr)` (2) `(pvvq)^^(~q)` (3) `~pvv(q^^t)`

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