Question

I have 4 yellow balls, 3 red balls, 2 blue balls and 1 green ball. I intend to put them into a translucent, colorless acrylic tube, where they will be on top of each other vertically. In how many different ways I can form this column balls so that the yellow and red are together?
a) 2500

b) 500

c) 10!

d) 25200

Answer 1

There are
4 yellow balls
3 red balls
2 blue ball
1 green
Total number of arrangements 10!/4!3!=25200