perplexus.info :: Probability : A cent or more?

A cent or more? (Posted on 2017-05-01)

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 distribution	Brian Smith	2017-05-01 10:25:44
conditional nature of the problem (spoilers)	Charlie	2017-05-01 08:56:54

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