Banner Ad 1

Collapse

Announcement

Collapse
No announcement yet.

Counting problem

Collapse
This topic is closed.
X
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Counting problem

    I asked this under "Ask the Professor", but maybe this is a more appropriate place. Sorry about the duplication.
    I know that if you line up n= r1 +r2 +...rk colored balls where r1 balls have color 1, r2 balls have color 2 etc, the number of ways you can do it is
    n!/r1!r2!...rk!,
    is there a simple way to calculate how many ways to line them up if
    n< r1+r2+...rk ?
Working...
X