Question

упростить:
$frac{12!}{9!*3!}$

Answer 1

$displaystyle tt frac{12!}{9!cdot3!}=frac{9!cdot10cdot11cdot12}{9!cdot3!}=frac{10cdot11cdot12}{3!}=frac{10cdot11cdot12}{1cdot2cdot3}=5cdot11cdot4=bold{220}$

Answer 2

12!/(9!*3!=9!*10*11*12/(9!*1*2*3)=

10*11*12/(2*3)=5*11*4=220