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Question: Answered & Verified by Expert
The statement pattern $[(p \vee q) \wedge \sim p] \wedge(\sim q)$ is
MathematicsMathematical ReasoningMHT CETMHT CET 2020 (12 Oct Shift 1)
Options:
  • A a contradiction
  • B equivalent to $p \wedge q$
  • C a contingency
  • D a tautology
Solution:
2213 Upvotes Verified Answer
The correct answer is: a contradiction
\begin{array}{|c|c|c|c|c|c|c|}
\hline 1 & 2 & 3 & 4 & 5 & 6 & 7 \\
\hline \mathrm{p} & \mathrm{q} & \sim \mathrm{p} & \sim \mathrm{q} & \mathrm{p} \vee \mathrm{q} & (\mathrm{p} \vee \mathrm{q}) \wedge \sim \mathrm{p} & {[(\mathrm{p} \vee \mathrm{q}) \wedge \sim \mathrm{p}] \wedge \sim \mathrm{q}} \\
\hline \mathrm{T} & \mathrm{T} & \mathrm{F} & \mathrm{F} & \mathrm{T} & \mathrm{F} & \mathrm{F} \\
\hline \mathrm{T} & \mathrm{F} & \mathrm{F} & \mathrm{T} & \mathrm{T} & \mathrm{F} & \mathrm{F} \\
\hline \mathrm{F} & \mathrm{T} & \mathrm{T} & \mathrm{F} & \mathrm{T} & \mathrm{T} & \mathrm{F} \\
\hline \mathrm{F} & \mathrm{F} & \mathrm{T} & \mathrm{T} & \mathrm{F} & \mathrm{F} & \mathrm{F} \\
\hline
\end{array}
All entries in last column are F.
$\therefore$ It is contradiction.

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