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Provide counterexamples to each statement: a)Suppose a, m, n ∈ N and both m and n...

Provide counterexamples to each statement:

a)Suppose a, m, n ∈ N and both m and n divide a. Then mn divides a.

b) If A and B are finite sets, then |A \ B| = |A| − |B|.

c) If f : A → B and g : B → C are functions and f : A → B is 1-1, then the composition g ◦ f : A → C is 1-1

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