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The probability of getting at least 1 answer correct = 1 - Probability of getting all answers correct.

So in your case it for be P(at least 1 answer correct) = 1 - 1/256

where 256 is your sample space, |S| = 2^8.

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Q: On an eight question true false quiz a student guesses each answer What is the probability that he gets at least One of the answers correct?
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