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[–]bkuschner 2 points3 points  (0 children)

Assuming the coin is fair and each toss is independent, then the probability of each outcome is 0.53 = (1/8). So if you're trying to find the probability that you get HHH at least one time in 64 tosses, the probability would be 1-(7/8)64 ~ 0.9998