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If (f:A\to B) is onto and (A), (B) are finite sets, which relation is always true?

Answer and explanation

Correct answer: (n(A)\ge n(B))

Step 1: In an onto function, every element of (B) needs at least one element from (A). Step 2: Therefore, (A) cannot have fewer elements than (B). Step 3: For finite sets, (n(A)\ge n(B)) is a necessary condition for onto.

Related tags

Onto FunctionFinite SetsCardinalityClass 12Relations And FunctionsMathematicsClass 12 Mcq

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