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30 August, 09:32

There are 3 quarters, 4 dimes and 7 nickels in a change purse. Suppose 3 coins are selected without replacement. What is the probability of selecting a quarter, then a dime, and then a nickel?

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  1. 30 August, 09:37
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    Prob of just quarter is 3/14 for a dime is 4/14 and for a nickel its 7/14

    then all you do is multiply them all together to get 306122449 / 10000000000 that took me way to long
  2. 30 August, 09:42
    0
    0.037%

    How I did it:

    I did 3/13, and got 0.23, I didn't do 14 because if its going to be chosen, its going to have one less, and I did the same for the other ones. Then I simply just multiplied them.
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