Article updated on September 19, 2017

The formula in cell E2 returns duplicate values from column A but values in column C are excluded from the list.

Formula in cell E2:

=IFERROR(LOOKUP(2, 1/((COUNTIF($A$2:$A$20, $A$2:$A$20)>1)*(COUNTIF($E$1:E1, $A$2:$A$20)=0)*(COUNTIF($C$2:$C$3, $A$2:$A$20)<>1)), $A$2:$A$20), "")

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