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For each of the following functions, state whether it is injective, surjective, and/or bijective, and why. (a) The function f(n) = 2n, mapping from

For each of the following functions, state whether it is injective, surjective, and/or bijective, and why. (a) The function f(n) = 2n, mapping from integers to integers. (b) The function q(d), with codomain N20, which maps any formula of predicate logic to the number of quantifiers in that formula.

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