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Two Coins

Braingle.com on

Published in Brain Teasers

Suppose I flip two coins, without letting you see the outcome, and I tell you that at least one of the coins came up heads, what is the probability that the other coin is also heads?


Solution:

1/3.

For two coins, there are four possible outcomes: HH, HT, TH, TT, since we know that at least one was a head, we can eliminate TT. Of the remaining three possibilities, only 1 allows the second head: HH.

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Today's brain teaser courtesy of Braingle.com.


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