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Old 01-16-2016, 07:35 PM
xor xor is offline Windows 10 Office 2013
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Join Date: Oct 2015
Posts: 1,101
xor is a name known to allxor is a name known to allxor is a name known to allxor is a name known to allxor is a name known to allxor is a name known to all
Default Sum every third

=sumproduct(--(mod(row($f$12:$f$42),3)=0),$f$12:$f$42)
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