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You have a coin (that we do not know is biased or not) that has a...

You have a coin (that we do not know is biased or not) that has a probability "p" of coming up Heads (which may be different than 1/2). Suppose you toss this coin repeatedly until you observe 1 Head. What is the expected number of times you have to toss it?

Math   Statistics-And-Probability   
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