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What is g(4.1) for the function g(x) = ⌈x⌉?

Answer and explanation

Correct answer: 5

The ceiling function ⌈x⌉ is defined as the least integer greater than or equal to x. Because 4.1 lies strictly between 4 and 5, the smallest integer that is at least 4.1 is 5. Hence g(4.1) = ⌈4.1⌉ = 5, so option A is correct. A common error is to use the floor function: ⌊4.1⌋ = 4, which explains option B but does not follow the ceiling definition. Option C is simply the input and is not an integer, whereas a ceiling value must be an integer. Option D has no connection with the stated rule. The result illustrates the step-like behavior of the ceiling function for non-integer inputs.

Related tags

Ceiling-FunctionStep-FunctionsFunction-ValuesStandard-FunctionsRelations And FunctionsGraphs Of Standard FunctionsMathematicsClass 11 Mcq

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