Fetch formula from cell (or dropdown box)

I have a table with a calculation, and would like to easily switch formulas.

So I'd have a list of formulas next to the table, and with a dropdown box, would like to let the user choose which formula is used in the table.

Attached a simple example of the concept (screenshot below). The formula in the column "Result" should adapt to the selection in a dropbox, which would show Formula1, Formula2, etc.