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The function f : N → N given by f(x) = 2x is classified as which of these?
AOnto but not one-one
BBoth one-one and onto
CNeither one-one nor onto
DOne-one but not onto
Answer & Solution
Correct answer: D. One-one but not onto
2x1 = 2x2 gives x1 = x2, but 1 in N is never of the form 2x.
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