Posted by **destiny** on Thursday, September 1, 2011 at 2:33am.

yancey collects plastic banks. he has 3 different banks-a pig, cow and horse. how many ways can he arrange his banks n a shelf?

- math -
**MathMate**, Thursday, September 1, 2011 at 10:15am
He has three choices for the left item, 2 choices for the middle item, and one and only one choice for the right item.

By the multiplication principle, there are 3*2*1=6 ways to arrange the banks on the shelf (where order is important).

- math -
**kevin**, Thursday, November 8, 2012 at 9:51pm
3.2.1=6

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