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If (A={1,2}) and (B={a,b,c,d}), can onto functions from (A) to (B) exist?

Answer and explanation

Correct answer: No, because the domain has fewer elements than the codomain

Step 1: In an onto function, every element of the codomain must be an image. Step 2: Here the domain has (2) elements and the codomain has (4) elements. Step 3: Two inputs cannot cover four different codomain elements, so no onto function exists.

Related tags

Onto FunctionFinite SetsDomain CodomainCountingIntroduction To RelationsRelations And FunctionsMathematicsClass 12 Mcq

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