The statement $\sim(p \leftrightarrow \sim q)$ is :

  • A
    a tautology
  • B
    a fallacy
  • C
    equivalent to $(p \leftrightarrow q)$
  • D
    equivalent to $\sim p \leftrightarrow q$

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Which of the following statement patterns is a tautology?

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$r: \text{If } p \to q \text{ is false, then } p \lor q \text{ is false.}$
$s: \text{If } p \leftrightarrow q \text{ is false, then } p \lor q \text{ is false.}$
The truth values of $r \to s$ and $s \to r$ are respectively . . . . . .

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Simplify the following switching circuit and find the corresponding Boolean expression.

The correct simplified circuit diagram for the logical statement $[\{q \wedge (\sim q \vee r)\} \wedge \{\sim p \vee (p \wedge \sim r)\}] \vee (p \wedge r)$ where $p, q, r$ represent switches $S_1, S_2, S_3$ respectively.

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