jmc

The probability that the first non-negative single-digit number in Bob's password is also odd is $\frac{5}{10}=\frac{1}{2}$ because exactly $5$ out of the $10$ non-negative single-digit numbers are odd. The probability that the following character in Bob's password is a letter is $1$ since it must be a letter according to the prescribed format. Finally, the probability that the last character is a positive single-digit number is $\frac{9}{10}$ because $0$ is the only non-negative single-digit number that is not positive. Hence the desired probability is $\frac{1}{2}\cdot 1\cdot \frac{9}{10}=\boxed{\frac{9}{20}}$ since the choices for the three characters are independent.