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9. (4 pts) Just answer yes or no in the box. No justifications needed. (a) Suppose f.NN has the rule f(n) = 5n + 1.

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9. (4 pts) Just answer "yes" or "no" in the box. No justifications needed. (a) Suppose f.NN has the rule f(n) = 5n + 1. Determine whether fis 1-1. (1 pts) (b) Suppose f.NN has the rule f(n) = 4n + 1. Determine whether fis onto N. (1 pts) (c) Suppose f.ZZ has the rule f(n) = 3n2 - 1. Determine whether fis 1-1. (1 pts) (d) Suppose f.ZZ has the rule f(n) = n-1. Determine whether fis onto Z (1 pts)

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