Question

Determine a formula do termo geral do p.a (2,7,12,...)?

Answer 1

a₁ = 2
r = 7 - 2 = 5
an = ?

an = a₁ + (n - 1)r
an = 2 + (n - 1) . 5
an = 2 + 5n - 5
an = 5n - 3