Respostas

2014-06-23T11:12:34-03:00
P.a. (4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84,88,92,96,100,104)
numero de termos=26
1 5 1
2014-06-23T11:16:58-03:00
An=a1+(n-1)×r
104=4+(n-1)×4
104=4+4n-4
4n=104
n=104÷4
n=26