A bag contains 10 red, 15 white, 25 green balls. What should be the minimum number of balls drawn without replacement so that you get 5 red, 3 white, 10 green balls.

Answer 1

In order to guarantee any reds at all, you need to draw 41, since the first 40 might be all green and white.

So, 45 draws will guarantee 5 reds.