If the argument below is valid, name which of the four valid forms of argument is represented. If it is not valid, name the fallacy that is represented.

If Sally is on vacation, then Tom is at work.
If Tom is at work, then the line at the post office is long.
Therefore, if Sally is on vacation, then the line at the post office is long.

Question

If the argument below is valid, name which of the four valid forms of argument is represented. If it is not valid, name the fallacy that is represented.
 
If Sally is on vacation, then Tom is at work.
If Tom is at work, then the line at the post office is long. 
Therefore, if Sally is on vacation, then the line at the post office is long.

anonymous · Answer

this statement is valid; let me know if you require a further explanation

anonymous · Answer

yes I need a little bit more information from what the question. states. if valid name which ones

anonymous · Answer

Hypothetical Syllogism
if p then q; if q then r; therefore, if p then r