If n is divisible by 10, then it is divisible by 2 or divisible by 5. ... 2. Let f : X → Y and g : Y → X be functions, and suppose that f ◦ g ... There are many different choices of (p, q) ∈ Z × Z+ which are assigned the same value by f. For example, f(1,1)=1= f(2,2). ... Since f is not an injection by part (a), it is not a bijection, either. 3 ...
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