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

Answer

Truth Table:
  Support Statement The resulting statement
  $1$ $2$ $3$ $4$
$A$ $B$ $A \leftrightarrow B$ $B \rightarrow A$
$1$ $T$ $T$ $T^*$ $T^*$
$2$ $T$ $F$ $F$ $T$
$3$ $F$ $T$ $F$ $F$
$4$ $F$ $F$ $T^*$ $T^*$
  $1, 2(\leftrightarrow)$ $2, 1(\rightarrow)$
Judgment of the validity of the argument: In the above truth table, four full columns have been formed. In which the column no$.3$ in the base statement and column no. $4$ is the representation of the result statement. Row out of the total four rows of the truth table. The base statement in $1$ and $4$ is truth $‘T’$ and all the resulting statements in the same row are also 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