Probability of drawing balls from a box There are four red and six blue balls in a box. Three balls are drawn from the box randomly. What is the probability of drawing at least two red balls?
This seems pretty simple but I can't seem to find the right answer for some reason.

Hint: If you draw at least two red balls, you must have drawn one of $\def\R{\color{maroon}{R}}\def\B{\color{darkblue}{B}}\R\R\R, \R\R\B, \R\B\R,$ or $\B\R\R$.  These are exclusive.  What is the probability of each?
