Question

o numero binominal
(20/3) vale​ ?

a-1.140
b-1.445
c-1.504
d-1.620
e-1.625​

Answer 1

Explicação passo-a-passo:

$\sf \dbinom{20}{3}=\dfrac{20!}{3!\cdot(20-3)!}$

$\sf \dbinom{20}{3}=\dfrac{20!}{3!\cdot17!}$

$\sf \dbinom{20}{3}=\dfrac{20\cdot19\cdot18\cdot17!}{3!\cdot17!}$

$\sf \dbinom{20}{3}=\dfrac{20\cdot19\cdot18}{3!}$

$\sf \dbinom{20}{3}=\dfrac{6840}{6}$

$\sf \dbinom{20}{3}=1140$

Letra A