Posted by sharan on Saturday, November 24, 2012 at 1:29am.
The mapping is f:N →N, given by F(n)= 2n^3+1,n belongs to N.
A. oneone and onto
B. onto not oneone
C. oneone not onto
D. neither oneone nor onto

maths  Steve, Saturday, November 24, 2012 at 4:53am
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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