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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?

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    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).

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