Which of the following is false?

  • A
    $p \vee \sim p$ is a tautology.
  • B
    $\sim (\sim p) \Leftrightarrow p$ is a tautology.
  • C
    $p \wedge \sim p$ is a contradiction.
  • D
    $((p \wedge p)$ $\rightarrow q)$ $\rightarrow p$ is a tautology.

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The symbolic form of the given switching circuit is equivalent to $..........$

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The negation of the statement $p \rightarrow (q \wedge r)$ is equal to .........

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Let $p$ and $q$ stand for the statements "$2 \times 4 = 8$" and "$4$ divides $7$" respectively. Then the truth values of the following biconditional statements are:
$(i)$ $p \leftrightarrow q$
$(ii)$ $\sim p \leftrightarrow q$
$(iii)$ $\sim q \leftrightarrow p$
$(iv)$ $\sim p \leftrightarrow \sim q$

$\sim (p \vee q) \vee (\sim p \wedge q)$ is logically equivalent to

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