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¦^´_ 1# myleoyes

=SUMPRODUCT(1/COUNTIF($B$3:$B$30,$B$3:$B$30))
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¦^´_ 4# myleoyes


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¦^´_ 6# myleoyes

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    =INDIRECT("Sheet1!B3:B"&LOOKUP(2,1/(Sheet1!$B$2:$B$301<>""),ROW(Sheet1!$B$2:$B$301)))
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=SUMPRODUCT(1/COUNTIF(x,x))
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