Respostas

2013-06-26T17:53:26-03:00

an = a1 * q^(n-1)
1250 = 2 * 5^(n-1)
1250 : 2 = 5^(n-1)
625 = 5^(n-1)
5^4 = 5^(n-1)
^4 = ^(n-1)
n = 4 + 1
n = 5

4 4 4
2013-06-26T17:56:04-03:00

PG:
a1 = 2
q = 5
an = 1250
n = ?
an = a1 * q^(n-1)
1250 = 2 * 5^(n-1)
1250 : 2 = 5^(n-1)
625 = 5^(n-1)
5^4 = 5^(n-1)
^4 = ^(n-1)
n = 4 + 1
n = 5

3 4 3