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A friend of yours flips three coins behind a screen. What is the probability that at least one of the coins come up tails? Suppose

A friend of yours flips three coins behind a screen. What is the probability that at least one of the coins come up tails?
Suppose they tell you that at least one of the coins came up heads. What is the probability that exactly two of the coins came up heads?
What is the probability that they flipped all three tails or all three heads?

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