Wednesday, January 20, 2010

Die Throws

With a standard six-sided die, how many throws are required on average before each of the six numbers has landed faceup?
(a) 10 (b) 15 (c) 20 (d) 25

1 comments:

  1. What does 6/6 + 6/5 + 6/4 + 6/3 + 6/2 + 6/1 = ?

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