For each of the following functions f, determine if it is injective (one-to-one), surjective (onto), and bijective. In the latter case, provide the inverse f-1¹. (a) f: R² R², (x,y) → (2y, -x) (b) f: NxN→ Z, (n, m) → 3¹5m (c) Let D be the set of all finite subsets of positive integers. We define F: N→D by the following rule: For every integer n, F(n) is the set of all the positive divisors of n.

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