Time to brush your skills in permutation and combinations with this riddle.
In a box, there is a mixture of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls.
What is the minimum number of balls, you have to pick up so that you have at least 4 balls of the same color?
So were you able to solve the riddle? Leave your answers in the comment section below.
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