Question
Determine the validity of the following arguments using the direct method of truth table:
$Pv \sim( Q \& R )$
$\sim P $
$\therefore \sim( Q \& R )$

Answer

 
Combining the two bases of this argument as a whole, the argument will be as follows:
${[(A \vee B) \rightarrow \sim C] \&(A \vee B)}$
$\therefore \sim C$
Truth Table:
  Support Statement The resulting statement
  $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$
$A$ $B$ $C$ $\sim C$ $A v B$ $(A v B) \rightarrow \sim C$ $[(A v B) \rightarrow \sim C] \& (A v B)$ $\sim C$
$1$ $T $T$ $T$ $F$ $T$ $F$ $F$ $F$
$2$ $T$ $T$ $F$ $T$ $T$ $T$ $T^*$ $T^*$
$3$ $T$ $F$ $T$ $F$ $T$ $F$ $F$ $F$
$4$ $T$ $F$ $F$ $T$ $T$ $T$ $T^*$ $T^*$
$5$ $F$ $T$ $T$ $F$ $T$ $F$ $F$ $F$
$6$ $F$ $T$ $F$ $T$ $T$ $T$ $T^*$ $T^*$
$7$ $F$ $F$ $T$ $F$ $F$ $T$ $F$ $F$
$8$ $F$ $F$ $F$ $T$ $F$ $T$ $F$ $T$
  $3(\sim)$ $1, 2(v)$ $5, 4(\rightarrow$) $6, 5(\&)$ As $4$
Judgment of the validity of the argument: A total of eight columns have been formed in the above fact sheet. In which the column no. 7th base statement and column no. 8 is the introduction of the result statement. Row out of the total eight rows of the truth table. The base statement in 2, 4 and 6 is the truth ‘T’ The result statement in the same row is 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