Question
If Lena's first number comes then Meena's second number will come.
Lena will come first. So, Meena will come second.

Answer

Hint: $P =$ Lina's first number will come.
$Q =$ Meena will come second.
Symbolic representation of the argument:
$P\rightarrow Q$
$P$
$\therefore Q$
Combining the two bases of this argument, the argument will be as follows:
$(P\rightarrow Q)\ \&\ P$
$\therefore Q$

Truth Table:
  Support Statement The resulting statement
  $1$ $2$ $3$ $4$ $5$
$P$ $Q$ $P\rightarrow Q$ $(P\rightarrow Q) \& P$ $Q$
$1$ $T$ $T$ $T$ $T^*$ $T^*$
$2$ $T$ $F$ $F$ $F$ $F$
$3$ $F$ $T$ $T$ $F$ $T$
$4$ $F$ $F$ $T$ $F$ $F$
  $1, 2(\rightarrow)$ $3, 1(\&)$ As $2$
Judgment of the validity of the argument: A total of five columns have been formed in the above fact sheet. In which the column no. $4th$ Constitution and Column. $5$ is the introduction of the resultant statement. Out of the total four rows of the truth table, only rows. In $1$ the base constitution is the truth $‘T’$ and in the same row the resultant constitution is also the truth $‘T’.$ Hence this argument is standard.

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