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?

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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?

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