![\displaystyle \frac{n!}{[-r + n]!r!} =\: _nC_r \\ \\ \frac{10!}{[-6 + 10]![6!]} = \frac{3628800}{[4!][6!]} = \frac{3628800}{[24][720]} = \frac{3628800}{17280} = 210](/tpl/images/0409/5119/60c99.png)
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