Concept explainers
Blind man’s bluff. You and a friend each pick a card from a regular deck of 52 cards but do not look at them. Both of you then hold your cards up by your foreheads so that you can each see the other’s card but you can’t see your own. Your friend is holding a 6. What is the probability that your card is higher?
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The Heart of Mathematics: An Invitation to Effective Thinking
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