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If (f:A\to B) is an onto function and (A) has (7) elements while (B) has (5) elements, which statement is definitely true?

Answer and explanation

Correct answer: At least two elements have the same image

Step 1: Onto means every element of (B) is hit by at least one element of (A). Step 2: Since (A) has (7) elements and (B) has (5), all images cannot be distinct. Step 3: For finite sets, compare cardinalities to judge one-one and onto quickly.

Related tags

FunctionsFinite-SetsOntoPigeonholeRelations And FunctionsMathematicsClass 12 Mcq

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