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Date: 2009-08-14 06:35 pm (UTC)So this counts the occurences of Ron getting money from Slytherin:
=SUMPRODUCT((A1:A10="Ron")*(C1:C10="Slytherin"))
And this would give the amount of money he got from there:
=SUMPRODUCT((A1:A10="Ron")*(C1:C10="Slytherin")*(B1:B10))
*geek*