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f: N to N with f(1) = f(2) = 1 and f(x) = x - 1 for x > 2 is
AOnto but not one-one
BBijective function
COne-one but not onto
DNeither one-one nor onto
Answer & Solution
Correct answer: A. Onto but not one-one
f(1) = f(2) breaks injectivity, while every y other than 1 equals f(y + 1) and 1 equals f(1), so f is onto.
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