perplexus.info :: Probability : Die Order

Die Order (Posted on 2013-01-04)

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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