Answer to Probability Quiz Question #2

D. coffee: a virtual certainty -- in fact it will probably contain thousands of them.

A. birthday: about one chance in three million.

B. roulette: a little less than one chance in a billion (i.e., a thousand million).

C. coin flips: just under one chance in a trillion (i.e., a million million).

Probability quizzes by Jeffrey S. Rosenthal.

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