2006-06-21 10:47:48 · 10 answers · asked by darcy_t2e 3 in Science & Mathematics ➔ Mathematics
Or does it have to do with sums? Like with sigma notation...
2006-06-21 10:51:00 · update #1
It's the symbol for factorial. It means multiply the number n by n-1, then by n-2, etc. until you get to 1, e.g., 5! = 5*4*3*2*1. Also, 0! is defined as 1.
2006-06-21 10:50:37 · answer #1 · answered by monger187 4 · 0⤊ 0⤋
! in math means factorial
n! (read as n factorial)
n! = n·(n - 1)·(n - 2)·(n - 3)·...·1
Examples:
5! = 5 · 4 · 3 · 2 · 1 = 120
7! = 7 · 6 · 5 · 4 · 3 · 2 · 1 = 5040
0! = 1
2! = 2 · 1 = 2
10! = 10 · 9 · 8 · 7 · 6 · 5 · 4 · 3 · 2 · 1 = 3628800
1! = 1
The formula for Permutation is
nPr = n!/(n - r)!
^_^
2006-06-22 07:20:00 · answer #2 · answered by kevin! 5 · 0⤊ 0⤋
It's a factorial symbol.
3! = 3 x 2 x 1 = 6
4! = 4 x 3 x 2 x 1 = 24
... and so on ...
2006-06-21 17:51:55 · answer #3 · answered by Craig D 2 · 0⤊ 0⤋
! means factorial. An integer is multiplied by every integer less than it, down to 1.
So 5! = 5 * 4 * 3 * 2 * 1.
2006-06-21 17:51:46 · answer #4 · answered by -j. 7 · 0⤊ 0⤋
It means 'Factoral'. 5! = 5*4*3*2*1.
A multiplication of the numbers in succession.
2006-06-21 17:50:53 · answer #5 · answered by commish144 2 · 0⤊ 0⤋
5! = 1*2*3*4*5
7! = 1*2*3*4*5*6*7
2006-06-21 17:51:04 · answer #6 · answered by swissnick 7 · 0⤊ 0⤋
! is a symbol for Factorial.
6! = 6x5x4x3x2x1
Yes, it has to do with permutations, in this equation:
P(n,r) = n!/(n-r)!
or
P(n,r) = n! divided by (n-r)! <-- just a clearer version of the first given equation.
Hope it helps!
2006-06-21 17:55:10 · answer #7 · answered by Cap'n Eridani 3 · 0⤊ 0⤋
3! = 3x2x1 = 6
2006-06-21 17:51:26 · answer #8 · answered by az 5 · 0⤊ 0⤋
Hey dude, thank you for giving me a chance to earn 2 points. ! is called as factorial sign.
x! = x*(x-1)(x-2)...1
In permutations too this is being used,
nPr = n!/(n-r)!
Thanks...
2006-06-22 01:14:12 · answer #9 · answered by Azmil M. 2 · 0⤊ 0⤋
factorial symbol
2006-06-21 17:53:36 · answer #10 · answered by Vivek 4 · 0⤊ 0⤋