A student studying for a vocabulary test knows the meanings of 10 words from a list of 20 words. If the test contains 10 words from the study list, what is the probability that at least 8 of the words on the test are words that the student knows? (Round your answer to three decimal places.)

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A student studying for a vocabulary test knows the meanings of 10 words from a list of 20 words. If the test contains 10 words from the study list, what is the probability that at least 8 of the words on the test are words that the student knows? (Round your answer to three decimal places.)

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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1/2 * 9/19 * 4/9*7/17 * 3/8 * 1/3 * 2/7 *3/13 multiply all those fractions:
thats not right.
So this looks like a set/stats problem. So first you have to figure out 20 choose 10, which will be the total number of possible sets of ten test questions. Then you have to figure out the probability of there being 8, or 9, or 10 words he knows on the test. There is a formula for this in whatever stats/probability text book your using (I'm guessing you're in such a class judging on the kind of questions you're asking).

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