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If A = {1, 2} and B = {a, b, c}, how many subsets of A × B are not functions from A to B?

Answer and explanation

Correct answer: 55

The Cartesian product A × B contains |A||B| = 2 × 3 = 6 ordered pairs. Therefore it has 2⁶ = 64 subsets in total. A function from A to B must contain exactly one ordered pair beginning with each element of A. For each of the two inputs, there are three possible outputs, so the number of functions is 3² = 9. Every such function is a subset of A × B, and all remaining subsets fail the function condition because an input is missing, has multiple outputs, or both. Hence the number of non-function subsets is 64 − 9 = 55. Option D is the total number of subsets, not the requested number.

Related tags

Cartesian ProductFunctionsCountingSubsetsFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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