Question
Determine the validity of the following arguments using the direct method of truth table:
$(A\ v\ B) \rightarrow \sim\ C$
$A\ v\ B$
$\therefore \sim\ C$

Answer

Combining the two bases of this argument as a whole, the argument will be as follows:
$[A\ v\ (B\ \&\ C)]\ \&\ \sim\ A$
$\therefore B\ \&\ C$
Truth Table:
  Support Statement The resulting statement
  $1$ $2$ $3$ $4$ $5$ $6$ $7$ $8$
$A$ $B$ $C$ $\sim A$ $B\ \&\ C$ $A\ v\ (B\ \&\ C)]$ $[A\ v\ (B\ \&\ C)]\ \& \sim A$ $B\ \&\ C$
$1$ $T$ $T$ $T$ $F$ $T$ $T$ $F$ $T$
$2$ $T$ $T$ $F$ $F$ $F$ $T$ $F$ $F$
$3$ $T$ $F$ $T$ $F$ $F$ $T$ $F$ $F$
$4$ $T$ $F$ $F$ $F$ $F$ $T$ $F$ $F$
$5$ $F$ $T$ $T$ $T$ $T$ $T$ $T^*$ $T^*$
$6$ $F$ $T$ $F$ $T$ $F$ $F$ $F$ $F$
$7$ $F$ $F$ $T$ $T$ $F$ $F$ $F$ $F$
$8$ $F$ $F$ $F$ $T$ $F$ $F$ $F$ $F$
  $1(\sim )$ $2, 3(\&)$ $1, 5(v)$ $6, 4(\&)$ As $5$
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. Out of a total of eight rows of the truth table, only rows. The base statement in $5$ is the truth $‘T’$ and the resulting statement in the same row is also the truth $‘T’.$ Hence this argument is standard.

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