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Probabilty of pulling 3 pennies from a group of coins

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I have 5 dimes, 10 pennies, and 8 quarters. I pull out 3 coins, what is the probability that I pull out 3 pennies. I only get to pick three coins. I am looking or the way that one can see this in step by step terms.

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The required probability is calculated.

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Totally there are 10 + 8 = 18 coins

You can pull out 3 coins from these 18 coins in ...

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