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VBA Random Number Generation Guide
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- Basic Rnd Function
- VBA Rnd generates random numbers between 0 and 1, excluding 1
- Function accepts optional argument like Rnd[Number]
- Passing negative numbers generates same random number
- Passing 0 repeats most recent random number
- Without argument, Rnd produces same results each Excel restart
- Randomize Statement
- Randomize creates new seed number based on computer's system timer
- System time changes unpredictably, eliminating predictable patterns
- Randomize statement can be used with or without arguments
- Custom Functions
- Custom functions can combine Rnd with Randomize functionality
- RANDBETWEEN function generates random numbers between two numbers
- Custom functions can be created in VBA modules
- Custom functions allow better control over random number generation