Question 1113772
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There are 3 red marbles and 8 others. You are making sets of either 2 of the 3 red and 3 of the 8 others, or all 3 of the red and 2 of the 8 others:<br>
"3 choose 2" times "8 choose 3" plus "3 choose 3" times "8 choose 2"<br>
(3C2)*(8C3)+(3C3)(8C2) = 3*56+1*28 = 168+28 = 196