Probability of the Same Colour
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In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls will you have to pick up so that you have at least 4 balls of the same colour? 
13
If we pick any number of balls up to 12, it is possible that the set may be composed of max. 3 balls of one colour. (i.e., 3 balls each of each color) However, if we pick 13 balls, there must be at least four balls of same colour.
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