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If (f:A\to B) is onto, what must be true for any element (b) of the codomain (B)?

Answer and explanation

Correct answer: There exists (a\in A) such that (f(a)=b)

Step 1: The definition of onto is about every element of the codomain. Step 2: For every (b\in B), at least one (a\in A) must exist such that (f(a)=b). Step 3: The existence of a preimage is the key idea in onto nature.

Related tags

Onto DefinitionPreimageCodomainFunctionOnto FunctionRelations And FunctionsMathematicsClass 12 Mcq

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