RandInt ?!

[Romulator]

RandInt(1, 2) chooses a random number between 1 and 2.
Since it is an Int, it can only be 1 or 2.
Therefore, it is 50% of being 1, and 50% of being 2.

The same thing happens to (3, 4) and (5, 6).

Think of it like this. You flip a coin. It can be either heads, or tails.
Since there is no other possible outcome (unless it lands on its side o.0), its a 50/50 chance of being either heads or tails.

The three RandInt's are doing the same thing. A coin flip.