Thanks Myrna
"Myrna Larson" wrote:
The general formula for number of permutations, where n is the number of items
in the population (45 in your case), r is the number of items in a set (6 in
your case), and the exclamation point means "factorial" is
num permutations = n! / (n - r)!
The number of combinations is the number of permutations divided by r!, i.e.
num combinations = n! / [(n - r!) * r!]
On Sun, 25 Sep 2005 16:09:01 -0700, "RedChequer"
wrote:
Harald.
If 3x2x1 = 6, would I be correct in assuming that 45x44x43x42 etc...divided
by 6x5x4x3x2x1 give a result of 6 numbers in numerical order such as, from
45 numbers pick 6 numbers ie. 14,16,25,30,40,45
"Harald Staff" wrote:
Hi
In permutations the order is important. Say we have three runners AB and C.
If they finish in order CAB then it's a different result from BCA. With
three different runners there are 1*2*3 possible outcomes = 6 permutations.
Combinations don't care about order. A "straight" poker hand 4-5-6-7-8 is
the same as the hand 6-7-8-4-5. Same combination, different permutation.
HTH. Best wishes Harald
"RedChequer" skrev i melding
...
Myrna,
I already posed a than yo reply bu I meant to ask, Wht is the difference
between Permutations & Combinations
|