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Set Theoryhard
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Consider the set of all functions f:{1,2,3,4}→{0,1}f: \{1, 2, 3, 4\} \to \{0, 1\}f:{1,2,3,4}→{0,1}. How many of these functions satisfy the condition f(1)+f(2)+f(3)+f(4)=2f(1) + f(2) + f(3) + f(4) = 2f(1)+f(2)+f(3)+f(4)=2?