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Question

Does the following limits exist? If they exist find the value
limx0e1/x

A
1
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B
0
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C
e
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D
does not exist
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Solution

The correct option is D does not exist
Let f(x)=e1/x.
Then f(0+0)=limh0e1/(0+h)=limh0=e(1/h)=e=, and f(00)=limh0e1/(0h)
=limh0e(1/h)=e=1e=1=0.
Since the right hand and the left hand limits are unequal, the limx0e1/x does not exist.
Ans: D

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