SOLUTION: From 4 red, 5 green, and 6 black ball pens, how many selection of 9 ball pens are possible if 3 of each color are to be selected?

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Question 635066: From 4 red, 5 green, and 6 black ball pens, how many selection of 9 ball pens are possible if 3 of each color are to be selected?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

From 4 red, 5 green, and 6 black ball pens,

3 from each color selected

 4C3%2A5C3%2A6C3+=+4%2A10+%2A20+ ways of selecting the nine pens 

nCx = n%21%2F%28x%21%28n-x%29%21%29