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2. You got a coin from your friend that is unfair, but do not know what...

2. You got a coin from your friend that is unfair, but do not know what is the probability of tail “ptail” is. Your friend tells you that in 1.5 out of 100 attempts, you need to flip 3 or more times in order to get a tail. For example, TTTH and TTTTTTH occurs 1.5 times in 100 attempts on average. What is the value of Ptail?

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