Mathematics, 08.08.2021 18:20, kay4358

In a closed box there are 7 blue balls and 5 red balls. Randomly pick one from the box one at a time until the ball is green, then stop. Find the probability that the person stops after the 4th time

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In a closed box there are 7 blue balls and 5 red balls. Randomly pick one from the box one at a time...