Question: Which functions in Exercise 12 are onto? In exercise 12 a) f (n) = n 1 b) f (n) = n2 + 1 c)

Which functions in Exercise 12 are onto?
In exercise 12
a) f (n) = n − 1
b) f (n) = n2 + 1
c) f (n) = n3
d) f (n) = n/2

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