How to copy Cell without changing the range reference

I have a problem completing my table/spreadsheet.
I have a reference for cloumn for a, b and c and and numbers on the rows> I have completed the formula for the first row but having problem when I copy it on the next row or the on the consecutive row because it increases the reference into 1 row and I want my reference range to be fixed.
please help

Use absolute references in your formulas, like:

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Cheers,