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Mathematics 15 Online
OpenStudy (anonymous):

A lot consists of 10 good articles, 4 with minor defects and 2 with major defects. One article is chosen at random. Find the probability that: (a) it has no defects, (b) it has no major defects, (c) it is either good or has major defects.

OpenStudy (anonymous):

I'm sorry, I got it. Thanks anyway. :)

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