Question

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ᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠᅠ​

Answer 1

Ответ:

$C_{12}^{10}=C_{12}^{12-10}=C_{12}^2=\dfrac{12\cdot 11}{2!}=\dfrac{132}{2}=66$

$ili:\ \ \ \ \ C_{12}^{10}=\dfrac{12!}{10!\, (12-10)!}=\dfrac{10!\cdot 11\cdot 12}{10!\, 2!}=\dfrac{11\cdot 12}{2!}=66$