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Die Order (Posted on 2013-01-04) Difficulty: 3 of 5
A single die is rolled four times.

What is the probability that the numbers that come up will be in ascending order (not necessarily strictly ascending, but never a lower number after a higher)?

Intended to be solved without a computer.

See The Solution Submitted by Charlie    
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re: No Subject | Comment 5 of 7 |
(In reply to No Subject by Ady TZIDON)

1. How did you arrive at the sequence a(1) = 6; a(2) = 21; etc.

2. Was the source Sloane's OEIS?

3. Was a computer used in looking this up?


  Posted by Charlie on 2013-01-05 08:39:24
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