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12-06-2015
Mathematics

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Determine the number of combinations of 7 things taken 4 at a time

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16-06-2015

[tex] _{7} C_{4} \\ \\ \frac{7!}{(7-4)!4!} \\ \\ \frac{7!}{3!4!} \\ \\ \frac{7*6*5*4*3*2*1}{3*2*1*4*3*2*1} \\ \\ \frac{7*6*5}{3*2*1} \\ \\ \frac{210}{6} \\ \\ 35[/tex]

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