# maths

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The mapping is f:N →N, given by F(n)= 2n^3+1,n belongs to N.
A. one-one and onto
B. onto not one-one
C. one-one not onto
D. neither one-one nor onto

• maths -

Think of the shape of the graph.

If we had f:R->R, it would be (A).

By restricting to N, it is (C), since many numbers (like 2) are not in the range.

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