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If (A) has (6) elements and (B) has (3) elements, what is the number of onto functions from (A) to (B)?

Answer and explanation

Correct answer: (540)

Step 1: Total functions are (3^6). Step 2: By inclusion-exclusion, onto functions (=3^6-\binom{3}{1}2^6+\binom{3}{2}1^6=729-192+3=540). Step 3: For counting onto functions, start with all functions and subtract those missing codomain elements.

Related tags

Onto FunctionCountingInclusion ExclusionClass 12Relations And FunctionsMathematicsClass 12 Mcq

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