Question

qual o termo geral da sequencia 2,4,6,8...?

Answer 1

r = 4-2 = 6-4 = 8-6 = 2.

a1 = 2.
r = 2.

an = a1 + (n-1)*r
an = 2 + (n-1)*2
an = 2 + 2n - 2
an = 2n