Same chapter3 marksDifficulty: Medium
Is the relation R = {(1, 1), (2, 2), (1, 2)} on the set {1, 2} reflexive, symmetric and transitive?
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3 marksDifficulty: Medium
Define a one-one function, an onto function and a bijection.
Original Khojo Papers practice question — not from a past board paper.
Answer
A function is one-one, or injective, if distinct elements of the domain have distinct images. It is onto, or surjective, if every element of the co-domain is the image of at least one element of the domain. A function that is both one-one and onto is a bijection.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Only a bijection has an inverse function.
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