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Lim X → 1 [ X − 1 ] Where [.] is the Greatest Integer Function, is Equal to

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Question

\[\lim_{x \to 1} \left[ x - 1 \right]\] where [.] is the greatest integer function, is equal to 

Options

  •  1  

  • 2    

  •  0  

  • does not exist                                

MCQ
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Solution

We have,

\[\lim_{x \to 1^-} \left[ x - 1 \right] = \lim_{h \to 0} \left[ 1 - h - 1 \right] = \lim_{h \to 0} \left[ - h \right] = - 1\]

Also, 

\[\lim_{x \to 1^+} \left[ x - 1 \right] = \lim_{h \to 0} \left[ 1 + h - 1 \right] = \lim_{h \to 0} \left[ h \right] = 0\] 

\[\therefore \lim_{x \to 1^-} \left[ x - 1 \right] \neq \lim_{x \to 1^+} \left[ x - 1 \right]\] 

Thus, 

\[\lim_{x \to 1} \left[ x - 1 \right]\] does not exist.
Hence, the correct answer is option (d).

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Chapter 29: Limits - Exercise 29.13 [Page 81]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.13 | Q 39 | Page 81

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