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A store advertises that there is a 90% chance their equipment will be trouble-free for a year. If you buy 6 of their products, what

A store advertises that there is a 90% chance their equipment will be trouble-free for a year. If you buy 6 of their products, what is the probability that . . . a. all of the products will be trouble-free b. half of the products will be trouble-free

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