Determine the number of different groups of 4 questions a teacher could select from a set of 10 distinct questions.

asked Dec 8, 2017 119k views

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$\displaystyle \binom{10}{4}=(10!)/(4!6!)=(7\cdot8\cdot9\cdot10)/(2\cdot3\cdot4)=7\cdot3\cdot10=210$

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