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UPSC NDA I 2013 Mathematics Paper

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Question : 117

Total: 120

Let N be the set of natural numbers and f:N→N be a function given by f(x)=x+1 for x∈N. Which one of the following is correct?

f is one-one and onto
f is one-one but not onto
f is only onto
f is neither one-one nor onto

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