Q3-x

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Indicate which of the following well-formed formulae are valid:

(A)

$\left(P\Rightarrow Q\right) {\wedge} \left(Q \Rightarrow R\right) \Rightarrow \left(P \Rightarrow R\right)$

(B)

$\left(P\Rightarrow Q\right) \Rightarrow \left( \neg P \Rightarrow \neg Q\right)$

(C)

$\left(P{\wedge} \left(\neg P \vee \neg Q\right)\right) \Rightarrow Q$

(D)

$\left(P \Rightarrow R\right) \vee \left(Q \Rightarrow R\right) \Rightarrow \left(\left(P \vee Q \right) \Rightarrow R\right)$

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