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A student must answers 8 out of 10 questionshow many choices does the student have?
Wiki User
∙ 14y ago
This is a combinations question. The answer is C(10,8), the number of combinations of 10 things taken 8 at a time, which also equals the number of combinations of 10 things taken 2 at a time. You can imagine why these are the same: choosing 8 questions to answer out of ten is the same thing as not choosing 2 questions to answer out of ten. C(10,2) = (10*9)/(2*1) = 45. There are 45 different choices the student can make of which eight questions to answer.
Wiki User
∙ 14y ago
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A test has 20 questions. Correct answers get +3 and incorrect answers (-1). A student answered 5 questions incorrectly. How many points did the student score?
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