seed is an optional Number value argument.
Rnd returns a random number greater than or equal to 0 and less than 1. If seed is equal to 0, Rnd returns the random number that was returned from the previous call to Rnd. If seed is not supplied or is greater than 0, then Rnd returns the next random number in the internally generated sequence of random numbers. If seed is less than 0, then Rnd uses this value of seed to start a new random number sequence and returns the first value in this sequence.
Used when your formula requires a randomly generated number such as for statistical calculations or for selecting records at random to limit the data in a report.
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