Question

calcule o 81 termo da p.a (2,6,10...)

Answer 1

jogue na formula
an = a1 + (n - 1) *r

a81 = 2 + (81 - 1) *4
a81 = 2 + 80*4
a81 = 2 + 320
a81 = 322

Answer 2

a1= 2

r= 6 - 2 = 4

an= a1 + (n - 1) • r

a81= 2 + (81 - 1) • 4

a81= 2 + 80 • 4

a81= 2 + 320

a81= 322