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If (A={1,2,3}), (B={a,b,c,d}), and (f:A\to B), can (f) be onto?

Answer and explanation

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

Step 1: In an onto function, every element of (B) must be an image of some element of (A). Step 2: Here (A) has (3) elements and (B) has (4), so covering all four elements is impossible. Step 3: For finite sets, if (|A|<|B|), an onto function cannot exist.

Related tags

Onto FunctionFinite SetsCardinalityExistenceRelations And FunctionsMathematicsClass 12 Mcq

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