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If p , q and r are three propositions , then which of the following combination of truth values of p , q and r makes the logical expression  ( p  q )  ( (~ p )  r )  → ( (~ q )  r ) false ?

1. p = F , q = T , r = F
2. p = T , q = F , r = T
3. p = T , q = T , r = F
4. p = T , q = F , r = F

Correct answer: p = F , q = T , r = F

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