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

Answer

Combining the two bases of this argument as a whole, the argument will be as follows:
$(\sim A\ v\ B)\ \& \sim A$
$\therefore\ \sim B$
Truth Table:
  Support Statement The resulting statement
  $1$ $2$ $3$ $4$ $5$ $6$
$A$ $B$ $\sim A$ $\sim A\ v\ B$ $(\sim A\ v\ B)\ \&\ \sim A$ $\sim B$
$1$ $T$ $T$ $F$ $T$ $F$ $F$
$2$ $T$ $F$ $F$ $F$ $F$ $T$
$3$ $F$ $T$ $T$ $T$ $T^*$ $F^*$
$4$ $F$ $F$ $T$ $T$ $T$ $T$
  $1 (\sim )$ $3,2(v)$ $4, 3(\&)$ $2(\sim )$
               
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. $5$ Supporting Statements and Columns. $6$ is the representation of the result statement. Row out of the total four rows of the truth table. The base statement in $3$ and $4$ is truth $‘T’.$ But of the row. The result statement in $3$ is false $‘F’.$ Hence this argument is disproportionate.

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