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Using numbers 1,3,4,6, and basic arithmetic operations (addition, subtraction, multiplication, and division) and parentheses, obtain and an expression that evaluates to 24. You may use only these numbers and only these operations. Every number should be used exactly once. Numbers cannot be concatenated, i.e. you cannot use 13 or 146.
A certain subject caught the attention of a walking couple. They started to argue. He said: It's red. She said: No, it's black. He shot back: Yeah? Then why is it white? She replied: Because it's green, silly. What are they arguing about?