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If (A={1,2,3,4}), (B={p,q,r}), and (f={(1,p),(2,q),(3,p),(4,q)}), why is (f) not onto?

Answer and explanation

Correct answer: Because (r) has no preimage

Step 1: The listed images are only (p) and (q). Step 2: The codomain element (r) is not obtained from any domain element. Step 3: Even one missed codomain element destroys onto nature.

Related tags

Finite MappingNot OntoMissing ImagePreimageOnto FunctionRelations And FunctionsMathematicsClass 12 Mcq

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