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a
S = ---------
1 - q
S(1 - q) = a
a
(1 - q) = ------
S
a
-q = ------- - 1
S
a
1 - ----- = q
S
4
----
9
1 - -------- = q
4
---
3
4 * 3 3 1
q = --------- = ---- = ------
4 * 9 9 3
1
q = -----
3
Espero que te sirva