Question
Determine the validity of the following arguments using the direct method of truth table:
$P \rightarrow\ \sim Q$
$\therefore Q \rightarrow \ \sim P$

Answer

Truth Table:
  Support Statement The resulting statement
  $1$ $2$ $3$ $4$ $5$ $6$
$P$ $Q$ $\sim P$ $\sim Q$ $P \rightarrow\ \sim Q$ $Q \rightarrow\ \sim P$
$1$ $T$ $T$ $F$ $F$ $F$ $F$
$2$ $T$ $F$ $F$ $T$ $T^*$ $T^*$
$3$ $F$ $T$ $T$ $F$ $T^*$ $T^*$
$4$ $F$ $F$ $T$ $T$ $T^*$ $T^*$
  $1(\sim )$ $2(\sim )$ $1, 4(\rightarrow)$ $2, 3(\rightarrow)$
Judgment of the validity of the argument: A total of six columns have been formed in the above fact sheet. In which the column no. Base statement and column no. $6$ is the representation of the result statement. Row out of the total four rows of the truth table. The base statement in $2, 3$ and $4$ is the truth $‘T’$ and all the resulting statements in the same row are also the truth $‘T’.$ Hence this argument is standard.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free