# Math

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You can answer any 8 questions from the 12 questions on an exam. In how many different ways can you choose the 8 questions, assuming that the order in which you choose the questions is irrelevant?

• Math -

you must use combination formula.
n!/r!(n-r)!
Sub values
12!/ 4! 8!

! is factorial.

• Math -

Yes

• Math -

a student answers 75% on a math exam correct. If he answer 60 questions correctly How many questions are on the exam.

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