Question

Quantos elementos tem a P.A finita (-2,3,...43)

Answer 1

$> \: resolucao \\ \\ \geqslant \: progressao \: \: aritmetica \\ \\ r = a2 - a1 \\ r = 3 - ( - 2) \\ r = 3 + 2 \\ r = 5 \\ \\ = = = = = = = = = = = = = = = \\ \\ \\ an = a1 + (n - 1)r \\ 43 = - 2 + (n - 1)5 \\ 43 = - 2 + 5n - 5 \\ 43 = - 7 + 5n \\ 43 + 7 = 5n \\ 50 = 5n \\ n = \frac{50}{5} \\ n = 10 \\ \\ \\ resposta \: \: > \: \: pa \: \: de \: \: 10 \: \: termos \\ \\ \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant \geqslant \geqslant$