Question

determene o 8 termo da p.a(1,3,...)

Answer 1

A8= (1-7x2)
A8= 1+14
a8=15

Answer 2

a 1 = 1
a 2 = 3
r = a 2 - a 1
r = 3 - 1
r = 2
a 8 = a 1 + (n - 1 ).r
a 8 = 1 + (8 - 1 ).2
a 8 = 1 + 7.2
a 8 = 1 + 14
a 8 = 15