Since this is an array formula, you must press Ctrl+Shift+Enter
rather than just Enter when you first enter the formula and
whenever you edit it later. If you do this properly, Excel will
display the formula enclosed in curly braces {}.
Assuming of course the numbers are in A1:A20
Notice this is a formula array which must be entered with
Cctrl+Shift+Enter, do not put the brackets, just type it and press
Ctrl+Shift+Enter.
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