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Let A={1,2,3,4}, B={a,b}, and f(1)=a, f(2)=a, f(3)=b, f(4)=b. Which statement is correct?

Answer and explanation

Correct answer: It is a function and its range is B

The governing ideas are the definition of a function and the distinction between codomain and range. Every element of A has exactly one assigned image: 1 and 2 map to a, while 3 and 4 map to b. Repeated images are permitted; they simply make the function many-one rather than one-one. Since both a and b actually occur as outputs, the range is {a,b}, which equals the stated codomain B. Thus option B is correct. Option A incorrectly treats repeated outputs as invalid, option C omits the output b, and option D wrongly assumes that the domain and codomain must have equal sizes.

Related tags

Relations-FunctionsRangeMany-One-FunctionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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