looking for a math formula

Reply #8

RJOh — Mon, 15 Oct 2007 20:40:40 GMT

I stand corrected, when you use the scientific version of the calculator that comes in Windows to calculate 70!/(50! * 20!) the answer is not in scientific notation 1.618846036626579D+17 but in whole numbers 161884603662657876.

Reply #7

regy — Mon, 15 Oct 2007 02:41:14 GMT

All the info i was looking for is there !

Thanks for the link

Reply #6

johnph77 — Sun, 14 Oct 2007 13:38:36 GMT

http://www.johnph77.com/math/kenocomp.html

No ads, nothing to sell, for informational purposes only.

gl

j

Reply #5

time*treat — Sun, 14 Oct 2007 04:31:53 GMT

nice little app, but it seems to not like numbers this big.

closest you can get are 70C18 and 80C16

Reply #4

KY Floyd — Sun, 14 Oct 2007 01:56:49 GMT

Even easier:

http://www.wiley.com/college/mat/gilbert139343/java/java05_applet.html

Reply #3

regy — Sun, 14 Oct 2007 01:43:43 GMT

Wow ! Thank for the fast response guy's

Reply #2

RJOh — Sun, 14 Oct 2007 01:25:34 GMT

C(20,70) = 1.618846036626579D+17 It's approximately 161,884,603,662,658,000. You use the same formula that you use to calculate the number of smaller combinations within a pool of numbers but you will get the scientific notation when using your computer if the program can't handle more than 16 digits.

You might get more accuracy if you used a program designed to calculate keno odds or a scientific calculator.

Reply #1

time*treat — Sun, 14 Oct 2007 01:21:02 GMT

To calculate the number of combinations of n elements taken r at a time.

n C r = n! / [(n-r)! * r!]

70 C 20 = 70! / [(70-20)! * 20!]

= 70! / [50! * 20!]

= 1.6188 e 17

looking for a math formula

regy — Sun, 14 Oct 2007 00:40:28 GMT

Do someone know the formula to calculate how many X combination in Y !

For example lets say i wanna know how many 20 numbers combination bettween 1 and 70