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Why is (f:\mathbb{R}\to[0,1]), (f(x)=\frac{1}{1+e^{-x}}), not onto?

Answer and explanation

Correct answer: Because (0) and (1) are not obtained

Step 1: For every real (x), (0<\frac{1}{1+e^{-x}}<1). Step 2: The codomain ([0,1]) contains (0) and (1), but they are never obtained. Step 3: A value approached as a limit need not belong to the range.

Related tags

Onto FunctionLogistic FunctionEndpointNot OntoRelations And FunctionsMathematicsClass 12 Mcq

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