Posted by Carolyn on Wednesday, April 25, 2012 at 12:12am.
Andrew has 7 20c coins and 5 50c coins in his piggy bank. What is the smallest number of coins he might have to shake out to be certain of having 2 50c coins?

maths  PsyDAG, Wednesday, April 25, 2012 at 10:48am
I don't know what country you are in, but I am not aware of "20c coins."
To be4 absolutely certain of getting 2 50c coins, you would have to shake out 9 coins. This is assuming the worst scenario that all the 20c coins come out first.
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