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Consider the function f : {a, b, c} → {1, 2, 3} defined by f(a) = 1, f(b) = 1, f...
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Consider the function f : {a, b, c} → {1, 2, 3} defined by f(a) = 1, f(b) = 1, f(c) = 2. What is f-1({1, 3})?
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