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How many fair coins must you toss for the probability of exactly two heads to equal 50%?

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You flip three coins. What is the probability of exactly two heads given that there is at least one tail?Flip 6 fair coins. What is the probability of more heads than tails?I flip a fair coin 5 times and you flip 4 times. What is the probability you get at least as many heads as I do?

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