Riddle:

Two six-sided dice are fair in the sense that each face is equally likely to turn up. However, one of the dice has the 4 replaced by 3 and the other die has the 3 replaced by 4. When these dice are rolled, what is the probability that the sum is an odd number?

Python Solution:

Riddle source:

https://artofproblemsolving.com/wiki/index.php/1997_AHSME_Problems/Problem_10