I had this problem on an Alg.2 test today, and I'm just wondering if I did it correctly...
(nPr)/ (rPr) = n!/r!(n-r)!
n! / r! => n! x 0! => n!
(n-r)! (r-r)! (n-r)! r! r!(n-r)!
is my work correct? it turns out to be the same as nCr, which seems weird...
2007-02-07 17:22:10 · 2 answers · asked by azncr0wn 2 in Science & Mathematics ➔ Mathematics
whoops, the spaces aren't in there... the top was supposed to be divided by the bottom. thanks though! oh yeah, and the test question just said that; it didn't have numbers.
2007-02-07 17:37:17 · update #1
It looks about right. But it would be a *lot* easier if you'd define your terms ☺
Doug
2007-02-07 17:28:35 · answer #1 · answered by doug_donaghue 7 · 0⤊ 0⤋
the first line seems to be right but i'm not sure what you did in the second line
2007-02-07 17:30:06 · answer #2 · answered by wendywei85 3 · 0⤊ 0⤋