Need permutation help for n!/(n-r)!

chandra sekaran on Sat, 25 Jun 2016 14:54:03 +0200

Need permutation help for n!/(n-r)!

To: pari-users@pari.math.u-bordeaux.fr
Subject: Need permutation help for n!/(n-r)!
From: chandra sekaran <sekar.bc@gmail.com>
Date: Sat, 25 Jun 2016 18:23:55 +0530
Delivery-date: Sat, 25 Jun 2016 14:54:03 +0200
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Hi Bill

I have not put the question properly.

(18:08) gp > 50!/(50-3)!

%3 = 117600

Out of 117600 , some number following permutation will fall. I want to find the number.

[38, 40, 41] , [2,3,5], [10,11,12], [12,11,10]

or Find the three number permutation which will fall on 2000.

If n grows bigger( say 600! ) fast finding three number set and reverse is possible?

Thanks

Chandrasekaran B

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