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A cent or more? (Posted on 2017-05-01) Difficulty: 2 of 5
Mary had exactly 21 coins in her purse, total value of a round dollar.
While counting her money, she dropped a coin.

Evaluate the probability it was a penny.

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
Coin distributionBrian Smith2017-05-01 10:25:44
Some Thoughtsconditional nature of the problem (spoilers)Charlie2017-05-01 08:56:54
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