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CIL 2026 | System | Question-30

Which of the following is a necessary condition for a function $\mathrm{f}: A \rightarrow B$ to be invertible?

  1. $\mathrm{f}$ must be only onto
  2. $\mathrm{f}$ can be neither one-to-one nor onto
  3. $\mathrm{f}$ must be both one-to-one and onto
  4. $\mathrm{f}$ must be only one-to-one

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