The formula for the volume of a parallelepiped derived in Example 4 should not depend on the

Question:

The formula for the volume of a parallelepiped derived in Example 4 should not depend on the choice of which one of the tree vectors we call a, which one we call b, and which one we call c. Use this result to explain why |a ∙ (b × c)| = |b ∙ (a × c)| = c ∙ (a × b)|.