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Concrete blocks from a process are categorized as either suitable for their intended use, downgraded but usable for another purpose, or unusable. Suppose that 87%

Concrete blocks from a process are categorized as either suitable for their intended use, downgraded but usable for another purpose, or unusable. Suppose that 87% of the gears produced are suited for use, 10% are downgraded but usable, and 3% are unusable. Assume 15 blocks are selected at random, what is the probability 2 or more are unusable or downgraded

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