[rules-users] Math question.......?

[mathstudent350]

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:
http://www.numberempire.com/combinatorialcalculator.php?n=3&m=3&ordered=false&repeated=true
<http://www.numberempire.com/combinatorialcalculator.php?n=3&m=3&ordered=false&repeated=true>  

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.




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