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If h:{1,2,3,4} → {0,1} is defined by h(x)=1 when x>2 and h(x)=0 when x≤2, what is h(2)?

Answer and explanation

Correct answer: 0

This is a piecewise-defined function, so the value must be found by checking which condition contains the given input. For x=2, the first condition x>2 is false because 2 is not greater than 2. The second condition is x≤2, and it is true because equality is included: 2≤2. Therefore the second rule applies and h(2)=0. Option B is correct. Option A would be obtained only if the condition were x≥2 or if the first branch included equality. Option C is impossible because 2 is not an element of the codomain {0,1}, and option D is incorrect because the second branch explicitly defines the value at x=2. Careful attention to ≤ is the key concept.

Related tags

Relations And FunctionsPiecewise FunctionInequalitiesFunctions As A Special Kind Of RelationMathematicsClass 11 Mcq

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