[tex] > resolucao \\ \\ \geqslant pa \: (2............23) \\ \\ \\ an = a1 + (n - 1)r \\ 23 = 2 + (8 - 1)r \\ 23 = 2 + 7r \\ 23 - 2 = 7r \\ 21 = 7r \\ r = \frac{21}{7} \\ r = 3 \\ \\ \\ pa \: (2.5.8.11.14.17.20.23) \\ \\ \\ \\ \geqslant soma \: dos \: termos \\ \\ \\ \\ sn = \frac{(a1 + an)n}{2} \\ \\ sn = \frac{(2 + 23)8}{2} \\ \\ sn = \frac{25 \times 8}{2} \\ \\ sn = 25 \times 4 \\ \\ sn = 100 \\ \\ \\ \\ = = = = = = = = = [/tex]
