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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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Solution No Subject | Comment 4 of 7 |

a(1)= 6  ;

 a(2)=21  ;

a(3)=56 ;

>  a(4)=126   ; 

a(5)= 252  ;




p(4)=126/(6^4)= 7/72

Edited on January 4, 2013, 6:56 pm
  Posted by Ady TZIDON on 2013-01-04 18:50:51

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