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What is the probability that exactly three come up heads if


Question: 1. Four coins are flipped.

(a) What is the probability that exactly three came up heads?

(b) What is the probability that exactly three come up heads, if we saw that one came up tails?

2. Four coins are flipped.

(a) What is the probability that at least three came up tails?

(b) What is the probability that at least three came up tails, if we saw two coins land tails?

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