Hello everybody!

May I ask you a big favor?

I need help.

What I have is:

A bag contains marbles of three different colors with at least three marbles of each color.

Three marbles are randomly selected, without replacement. How many different color combinations are possible?

I tried to use Combinatorial Calculator here:

Combinatorial Calculator

And I've got : 10

Seems like it is the right answer, because textbook shows me the same..

But I want to understand the way of solving it.

Please show me step by step solution or the formula.

Thanks in advance.