Returns a random number between 0 and 1.
Syntax:
RAND()
This function produces a new random number each time Zapof function recalculates, greater than or equal to 0, and less than 1.
Example:
RAND()
returns a random number between 0 (inclusive) and 1 (exclusive).
RAND()*(b-a) + a
returns a random real number between a and b.