) A bag has 6 blue balls, 8 red balls, 5 black balls, and 9 white balls. You are asked to pick some balls from the bag, without looking into the bag. What is the minimum number of balls you must pick so as to be sure that at least 3 of them are of the same colour
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You're playing a game with a friend that involves guessing which cup he is hiding a ball under. There are 13 cups, and he has balls under four of them. What are the odds of finding a ball?
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