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22-06-2017
Mathematics

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Evaluate C(20, 18).

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jdoe0001 jdoe0001

22-06-2017

[tex]\bf _nC_r=\cfrac{n!}{r!(n-r)!}\qquad \begin{cases} n=20\\ r=18 \end{cases}\implies _{20}C_{18}=\cfrac{20!}{18!(20-18)!}[/tex]

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