5 to 3 against is 3⁄5 (as odds), which is a probability of 3⁄8. You are muddling probability and odds ratios in an unacceptable way.
5 to 3 against is 3⁄5 (as odds), which is a probability of 3⁄8. You are muddling probability and odds ratios in an unacceptable way.