There are 3 red, 4 blue and 2 black balls in a bag. In how many ways can we arrange these balls on a line if same colors are together?
9! . 3!
4! .3! .2!
5! .4! .2! .3!
2! .3! .5!
9! .3! .4! .2!
6!
4!
7!
8!
5!
How many numbers can be written by using the digits of the number 112333
10/15
12/15
9/15
11/15
14/15
