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So many quintuplets... (Posted on 2011-03-17) Difficulty: 3 of 5
Determine the total number of quintuplets (A,B,C,D,E) of positive integers such that A<=B<=C<=D<=E<=N. Both analytic and software solution for N=1, 2, ...9,10,...N required.

  Submitted by Ady TZIDON    
Rating: 4.0000 (3 votes)
Solution: (Hide)
My recursive formula for f(n): f(1)=1; f(n)=f(n-1)*(f+4)/(n-1)

See also excellent presentation and solution by Charlie.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re: solution + spoilerAdy TZIDON2011-03-17 18:34:07
SolutionSolutionMath Man2011-03-17 17:32:03
SolutionsolutionCharlie2011-03-17 13:31:16
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