Question

Determine o décimo termo de P.A (1, 5, 9,...)

Answer 1

r = 5 - 1 = 4
a1 = 1
n = 10

an = a1 + (n-1) * r
an = 1 + (10 - 1) * 4
an = 1 + 9 * 4
an = 1 + 36
an = 37