Question

1. Qual o 19º termo da
sequencia a = n2-n/2?

Answer 1

$> resolucao \\ \\ \\ > o \: 19 \: termo \: da \: sequencia \\ \\ \\ > an = \frac{n {}^{2} - n}{2} \\ \\ > a19 = \frac{19 {}^{2 } - 19}{2} \\ \\ > a19 = \frac{361 - 19}{2} \\ \\ > a19 = \frac{342}{2} \\ \\ > a19 = 171 \\ \\ \\ > > > > >$

Answer 2

Explicação passo-a-passo:

$an = \dfrac{n {}^{2} - n}{2}$

$a19 = \dfrac{19 {}^{2} - 19 }{2}$

$a19 = \dfrac{361 - 19}{2}$

$a19 = \dfrac{342}{2}$

$a19 = 171$