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5 independent events, each of them with a probability of 1/2; you need to multiply all together, so you get (1/2) to the power 5.Note: any other specific combination you can get when throwing a coin 5 times - for example, head, tails, head, tails, head - will have the same probability.

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Q: What is the probability of tossing a single coin and getting 2 heads before you get 3 tails?
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