How many different signals can be made from 4 red, 2 white and 3 green flags by arranging all of them vertically on a flagstaff?

Explanation

We have to arrange `9` flags, out of which `4` are of one kind,`2` are of another kind and `3` are of the third kind.



So total numbers of different signals =`(9!)/(4!2!3!​)=1260`