Question
A$\rightarrow$ ~ B
B
$\therefore$ ~ A

Answer

Combining the two bases of this argument as a whole, the argument will be as follows:
(A$\rightarrow$ ~ B) & B
$\therefore$ ~ A
Truth Table:
  Support Statement The resulting statement
  1 2 3 4 5 6 7
A B ~ A ~ B A$\rightarrow$ ~ B (A$\rightarrow$ ~ B) & B ~ A
1 T T F F F F F
2 T F F T T F F
3 F T T F T T$^*$ T$^*$
4 F F T T T F T
  1(~) 2(~) 1, 4($\rightarrow$) 5, 2(&) As 3
Judgment of the validity of the argument: The full seven columns are presented in the above truth table. In which the column no. 6th base statement and column no. 7 is the introduction of the result statement. Row out of the total four rows of the truth table. The base statement in 3 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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