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All 10 digits (Posted on 2012-07-06) Difficulty: 3 of 5
Pi takes 33 digits to get all 10 digits.
However, e only takes 21 digits.
Suppose you pick random digits from 0 to 9 with probability 1/10 of each digit. What is the average number of digits required to get all 10 digits?

See The Solution Submitted by Math Man    
Rating: 5.0000 (1 votes)

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re(2): Leading answer (spoiler) Comment 5 of 5 |
(In reply to re: Leading answer (spoiler) by Math Man)

The way I interpreted it, it didn't matter about leading zeros, as you are certain to have some digit first, and without leading zeros the first expected lenght involved is just 9/9 instead of 10/10, but from then on it's still 10/9, etc. as now, whether the first digit was a zero or a guaranteed non-zero, it's still the same.
  Posted by Charlie on 2012-07-08 23:30:43

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