Question: Suppose Bob's chances of getting a math problem wrong on a timed test is 0.10. Bob works 10 randomly chosen math problems. What's the chance

Suppose Bob's chances of getting a math problem wrong on a timed test is 0.10. Bob works 10 randomly chosen math problems. What's the chance he gets at least one of them wrong?

1 - .10^10

1 - .90^10

.10^10

.90^10 (to the 10th power)

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