|There's nothing wrong with using 3 conditions inside an AND, but you are missing the parenthesis to close the AND. You are also missing a value_if_false argument for the IF.|
However, if you need to check all of the various combinations of A, B and C, then there might be a better way. I'm thinking a VLOOKUP table might work.
Can you supply some more details about what it is that you are trying to do?
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