A student studying for a vocabulary test knows the meanings

A student studying for a vocabulary test knows the meanings of 12 words from a list of 24 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.)

Solution

8 knows 2 do not knows + 9 knows 1 do not knows + 10 knows 0 do not knows / total

[12C8*10C2 + 12C9*10C1 + 12C10*10C0 ] / 24C10

=0.0125