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So many quintuplets... (
Posted on 20110317
)
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:
(
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My recursive formula for f(n): f(1)=1; f(n)=f(n1)*(f+4)/(n1)
See also excellent presentation and solution by Charlie.
Comments: (
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Subject
Author
Date
re: solution + spoiler
Ady TZIDON
20110317 18:34:07
Solution
Math Man
20110317 17:32:03
solution
Charlie
20110317 13:31:16
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