Hi there!

To generate all possible 4 digit combinations using the numbers 0-9, you can use the following :

This formula uses the ROW function to generate a series of numbers starting from 1, and then subtracts 1 to start the series from 0. The TEXT function is then used to format the numbers as 4 digits with leading zeros.

You can follow these steps to generate all possible combinations:

1. Enter the formula in cell A1.
2. Copy the formula down as many rows as you need to generate all possible combinations.