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21 December, 11:57

How many different combinations of pennies, nickels, dimes, quarters, and half dollars can a piggy bank contain if it has 20 coins in it?

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  1. 21 December, 15:12
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    Because there are 20 coins plus four bars = 24 items to choose. You want to choose where to put the four bars, thus C (24,4). There are four bars, not five. Note that four bars divide the 20 coins into five sections. Five bars would divide it into six, but we only have five different kinds of coins to choose from.
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