Question 226150
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How many ways can you choose 4 things out of 20 things?


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \left(20\cr\ 4\right)\ =\ \frac{20!}{4!(20-4)!}\ =\ \frac{20\times19\times18\times17}{4\times3\times2}]


You can do your own arithmetic.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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