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If the question concerned the number of combinations of three different coins, the answer is 23-1 = 7.

If the coins are a,b,and c, the combinations are

a, b, c, ab, ac, bc, abc.

If two of the coins are the same there are only 5 combinations and if all three are the same there are 3.

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โˆ™ 2012-03-02 12:37:21
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Q: How many combinations of coins in 3?
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