Question

a razao de (1/4,1/2,3/4...)

Answer 1

A1 = 1/4
A2 = 1/2
1/2 = 1/4 + (2-1)r
r= 1/2 - 1/4
r = 2 - 1
       4
r = 1/4 
Conferindo:
1 + 1
2    4   
2 + 1 = 3
   4       4