Posted by Jost on September 6, 2006, at 13:50:34
In reply to A math puzzle, posted by Alexus on September 6, 2006, at 1:37:34
It's little complicated, and I have to try to get a nap--
but it's a variation on getting combinations of things, mathematically--
nCk = The number of combinations of n things taken k at a time--
the variation is because you don't want all the combinations of 9 things, but only those that have more than 5 things in them-- so the formula isn't the simple combination formula-=
you can google it-- combinations permutations--
but my math is of the musty, HS variety--
Jost
poster:Jost
thread:683578
URL: http://www.dr-bob.org/babble/social/20060901/msgs/683694.html