3. From 4 red, 5 green and 6 black ballpens. How many selections of 9 ballpens are possible if 3

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3. From 4 red, 5 green and 6 black ballpens. How many selections of 9 ballpens are possible if 3 of each are to be selected? Clue: 1st activity n=4; r=3 2nd activity n=5; r=3 3rd activity n=6; r=3