Let's start with the fact that you don't understand how to compute odds and go from there.

1) Random does not mean entirely unconstrained.
Consider a pseudo-random generator that produces random numbers X, such that 0<= X < 1. Such a function does return 2 or 3 or -pi. But it does return a random number.

2) I don't know how to explain to you more clearly that your attempt to compute the probability in this way is mathematical nonsense. How much clearer can I make it?