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RANDOMIZE initializes (reseeds) the random-number generator using expression%.
 
RANDOMIZE [expression%]
    ■ If you omit expression%, BASIC pauses and asks for a value by printing
      the following message before executing the RANDOMIZE statement:
        Random Number Seed (-32768 to 32767)?
 
    ■ When you use the argument expression%, BASIC uses this value to
      initialize the random-number generator.
 
Usage Notes
    ■ If the random-number generator is not reseeded, the RND function
      returns the same sequence of random numbers each time the program
      is run. To avoid this, place a RANDOMIZE statement at the beginning
      of the program and change the argument with each run.
    ■ A convenient way to initialize the random-number generator is to use
      the TIMER function. Using TIMER ensures a new series of random numbers
      each time you use the program.