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An engineer at a microcircuit factory will inspect a batch of silicon wafers to try to...

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Basic Math

An engineer at a microcircuit factory will inspect a batch ofsilicon wafers to try to find defects. Assume that there are fourdefective integrated circuits in a container containing twentywafers. For that inspection two random wafers are selected.Calculate the probability that:
a) None of them have defects
b) At least one of the two has no defects.

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