hi Charoum. so there should be just 2 counts? A & C? if so, try this array formula:
Formula:
=SUM(IF(FREQUENCY(IF((B2:B1000>=G2)*(B2:B1000<=G4)*(COUNTIFS(C2:C1000,C2:C1000,D2:D1000,"Closed")=0),MATCH(C2:C1000,C2:C1000,0)),ROW(C2:C1000)-ROW(C2)+1),1))
...confirmed by pressing CTRL-SHIFT-ENTER to activate the array. You will know the array is active when you see curly braces { } appear around your formula. If you do not CTRL-SHIFT-ENTER you will get an error or a clearly incorrect answer. Press F2 on that cell and try again.
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