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

Answer

Truth Table:
  Support Statement The resulting statement
  $1$ $2$ $3$ $4$
$A$ $B$ $A \rightarrow B$ $B \rightarrow A$
$1$ $T$ $T$ $T^*$ $T$
$2$ $T$ $F$ $F$ $T$
$3$ $F$ $T$ $T^*$ $F^*$
$4$ $F$ $F$ $T$ $T$
  $1, 2(\rightarrow)$ $2, 1(\rightarrow)$
Judgment of the validity of the argument: A total of four columns have been formed in the above truth table. In which the column no. $3$ in the base statement and column no.$ 4$ is the representation of the result statement. Row no. The base statement in $1, 3$ and $4$ is ‘truth’ $‘T’.$ But row no. The result statement in $3$ is false $‘F’.$ Hence this argument is disproportionate.

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