Using geometric progression, express 0.4131313... as a fraction.
If you have been given this question to do you surley must have been shown how to relate an infinite periodic decimal as an infinite geometric series.
0.0131313... = 0.013 + 0.00013 + 0.0000013 + ..... a and r should be obvious. Go to your class notes or textbook and review the appropriate section of this topic.