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Question: Answered & Verified by Expert
The negation of the statement pattern $\sim \mathrm{S} \vee(\sim \mathrm{r} \wedge \mathrm{s})$ is equivalent to
MathematicsMathematical ReasoningMHT CETMHT CET 2023 (10 May Shift 2)
Options:
  • A $\mathrm{s} \wedge \mathrm{r}$
  • B $\mathrm{s} \wedge(\mathrm{r} \wedge \sim \mathrm{s})$
  • C $\mathrm{s} \wedge \sim \mathrm{r}$
  • D $\mathrm{S} \vee(\mathrm{r} \vee \sim \mathrm{s})$
Solution:
2600 Upvotes Verified Answer
The correct answer is: $\mathrm{s} \wedge \mathrm{r}$
$\begin{aligned}
& \sim(\sim s \vee(\sim r \wedge s)) \\
& \equiv s \wedge \sim(\sim r \wedge s)...[De Morgan's law] \\
& \equiv s \wedge(r \vee \sim s)......[De Morgan's law] \\
& \equiv(s \wedge r) \vee(s \wedge \sim s)...[Distributive law] \\
& \equiv(s \wedge r) \vee F...[Complement law] \\
& \equiv s \wedge r...[Identity law]
\end{aligned}$

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