In how many ways can four identical yellow balls and two identical red balls be arranged on the
circumference of a circle?

1) 6!/4!
2) 5!/(2!*4!)
3) 3
4) 2!

• arranging 4 yellows on the circle , we find 4 gaps ...put 2 red balls in those in 4c2 ways
  Since its a circle 4c2/2! ways ie; 3 ways
• 8 years agoHelpfull: Yes(0) No(0)