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If f:A→B and A={r,s,t}, how many pairs will the graph of f contain?

Answer and explanation

Correct answer: 3

The graph of a function f from A to B is the set of ordered pairs (x,f(x)) for all x in the domain A. A function must assign exactly one output to every domain element, so the graph contains one ordered pair for r, one for s and one for t. Since A={r,s,t} has three elements, the graph contains |A|=3 ordered pairs. The size of B does not determine the number of pairs; B may contain more, fewer, or the same number of elements, although each assigned output must belong to B. Therefore option A is correct. Option D confuses the codomain size with the domain size, while options B and C omit some of the required domain elements. The defining count comes from the domain.

Related tags

FunctionsGraph Of A FunctionOrdered PairsDomainFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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