random x

Be careful using random numbers in multiplayer, each client will come up with something different.
See multiplayer tutorials for more general information about locality.

The number returned is unlikely to be a whole number (e.g. 1, 4, 76, etc.).

To return a whole number combine random and mod.

The upper limit of the random number generator is exclusive. It is possible for random 1 to generate 0, but it will never generate 1. The largest number it will generate is 1 - eps where eps is the machine precision. (source: Suma on Biki)