The value of   is equal to?

Where {x} denote the fractional part of x.

  1. -1
  2. 1
  3. Limit doesn't exist

Answer (Detailed Solution Below)

Option 4 : Limit doesn't exist
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Detailed Solution

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Concept:

Greatest Integer Function: Greatest Integer Function [x] indicates an integral part of the real number x which is a nearest and smaller integer to x. It is also known as floor of x

  • In general, If n ≤ x ≤ n+1 Then [x] = n   (n ∈ Integer)
  • Means if x lies in [n, n+1) then the Greatest Integer Function of x will be n.

 

Example:

x

[x]

0 ≤ x < 1

0

1 ≤ x < 2

1

2 ≤ x < 3

2

 

Fractional part of x: fractional part will always be non-negative.

  • It is denoted by {x}
  • {x} = x - [x]

 

Existence of Limit:

 is exists if  and  exist and 

 

Calculation:

To Find: Value of 

As we know {x} = x - [x]

 

RHL = 

If x → 0+ then [x] = 0

RHL =         [Form (0/0)]

Apply L-Hospital Rule,

RHL = 1

 

LHL = 

If x → 0- then [x] = -1

RHL ≠ LHL

So, the limit doesn't exist.

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