Itdoesn't matter! and the other 5 permutations of the vectors differ only in sign. Since the sign does not matter.

In fact, with , , and , since , it is easy to see that .

Permuting the vectors just permutes the rows which only changes the sign. And, again, the volume is theabsolute valueof that.

(Three points determine a plane.Anytwo vectors, having the same "initial point", lie in a plane.)