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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1/2 * 9/19 * 4/9*7/17 * 3/8 * 1/3 * 2/7 *3/13
multiply all those fractions:

thats not right.

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