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I have a bag with 5 pennies and 6 nickels. I draw coins out one at a time at random. What is the probability that after  draws I have removed no more than 2 pennies from the bag?

 Jan 18, 2020
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 The cases are where we draw 4 pennies and 0 nickels, and 1 nickel and 3 pennies.  This leads to a probability of (6*5 + 18*10)/C(11,4) = 7/11.

 Jan 18, 2020

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