<PRE><B>Question 637540</B>
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The probability that the student will know the first question is *[tex \LARGE \frac{14}{20}].  Now, since one question is no longer being considered, the probability of the student knowing the second question is *[tex \LARGE \frac{13}{19}].  The probability of the third:  *[tex \LARGE \frac{12}{18}].  See the pattern?  Find the probabilities for all 8 questions, and then multiply all 8 probabilities.



John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
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