Popcorn was donated for the school fair by 3 different popcorn vendors they donated a total of 636 bags of popcorn each vendor d
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A and B must be disjoint. You have, by the inclusion/exclusion principle, that
where the last term is required to prevent double counting. When
and 
are disjoint, you have 
and 
, leaving you with
where the last term is required to prevent double counting. When