f: N to N, f(x) = 2x is
AOnto but not one-one
BOne-one but not onto
CNeither one-one nor onto
DBijective function
Answer & Solution
Correct answer: B. One-one but not onto
2x1 = 2x2 gives x1 = x2, but the value 1 in the codomain is not twice any natural number.
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