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

Answer

Truth Table:
  Support Statement The resulting statement
  $1$ $2$ $3$ $4$ $5$ $6$ $7$
$A$ $B$ $\sim A$ $\sim B$ $A\ v\ B$ $\sim A\ \&\ \sim B$ $\sim (A\ v\ B)$
$1$ $T$ $T$ $F$ $F$ $T$ $F$ $F$
$2$ $T$ $F$ $F$ $T$ $T$ $F$ $F$
$3$ $F$ $T$ $T$ $F$ $T$ $F$ $F$
$4$ $F$ $F$ $T$ $T$ $F$ $T^*$ $T^*$
  $1(\sim )$ $2(\sim )$ $1, 2(v)$ $3, 4 (\&)$ $5(\sim )$
Judgment of the validity of the argument: A total of seven columns are presented in the above fact sheet. In which the column. The $6th$ is the base statement and the $7th$ is the introduction of the result statement. The flower of the truth table is out of four rows. The base statement in $4$ is the truth $‘T’$ and the result statement in the same row is also the truth $‘T’.$ Hence this argument is standard.

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