Excel 2013: Why is automatic numbering not working for me ?
I click OK:
But nothing happens.
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According to your image, you don't have a first value. You want the series to have a step of 87, but Excel doesn't know what is the starting value. Specify the start value by selecting a cell that contains it.
If your starting value is the cell with 86, you need to select it. Then enter your step. But note that a step of 87 will mean 86+87. If you want to go from 86 to 87, then your step should be 1.