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If (f:A\to B) and (|A|=2), (|B|=4), what are the numbers of all relations and all functions respectively?

Answer and explanation

Correct answer: (256) and (16)

The number of relations is (2^{|A||B|}=2^8=256), and the number of functions is (|B|^{|A|}=4^2=16). Remember the two formulas separately.

Related tags

Relations Vs FunctionsCountingCartesian ProductFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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