Which of the following logical statements is a tautology?

  • A
    $[(p \to q) \land \sim q] \to \sim p$
  • B
    $(p \to q) \land (p \land \sim q)$
  • C
    $[(p \lor q) \land \sim p] \land \sim q$
  • D
    $[(p \lor \sim q) \lor (\sim p \land q)] \land r$

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Among the statements:
$(S1) \quad (( p \vee q )$ $\Rightarrow r ) \Leftrightarrow ( p$ $\Rightarrow r )$
$(S2) \quad (( p \vee q )$ $\Rightarrow r ) \Leftrightarrow (( p$ $\Rightarrow r ) \vee ( q$ $\Rightarrow r ))$

Which of the following sentences are statements? Give reasons for your answer.
The sum of all interior angles of a triangle is $180^{\circ}.$

The statement $p \to (q \to p)$ is equivalent to

If $p \to (q \lor \sim r)$ is false, then the truth values of $(p \leftrightarrow q) \land r$ and $\sim p \to \sim q$ are :

If the statement $p \leftrightarrow (q \rightarrow p)$ is false,then the true statement/statement pattern is

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