The negation of the statement $(p \vee q) \wedge (q \vee (\sim r))$ is

  • A
    $(\sim p \wedge \sim q) \vee (\sim q \wedge r)$
  • B
    $(\sim p \wedge \sim q) \vee (\sim q \vee r)$
  • C
    $(\sim p \vee \sim q) \wedge (\sim q \vee r)$
  • D
    $(\sim p \wedge \sim q) \vee (q \wedge r)$

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Which of the following statements is logically equivalent to $\sim (p \leftrightarrow q)$?

The negation of the logical statement $(p \vee \sim q) \rightarrow (p \wedge \sim q)$ is

Which of the following statement patterns is a tautology?
$S_1 \equiv (\sim q \wedge p) \wedge q$
$S_2 \equiv [p \wedge (p$ $\rightarrow q)]$ $\rightarrow q$
$S_3 \equiv (p \wedge q) \wedge (\sim p \vee \sim q)$
$S_4 \equiv (p \wedge q) \rightarrow r$

If $p$ and $q$ are true statements and $r$ is a false statement,then which of the following is correct?

State the converse and contrapositive of the following statement:
$p:$ $A$ positive integer is prime only if it has no divisors other than $1$ and itself.

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