Home
Class 12
MATHS
Let f:[1,3] to R be a function satisfyin...

Let `f:[1,3] to R` be a function satisfying `(x)/([x]) le f (x) le sqrt(6-x),"for all "x ne 2 and f(2)=1`, Where R is the set of all real number and [x] denotes the largest integer less than or equal to x.
Statement-1: `lim_(x to 2) f(x)` exists.
Statement-2: F is continuous at x=2.

A

Statement 1 is true, Statement 2 is true, Statement 2 is a correct explanation for Statement 1

B

Statement 1 is false, Statement 2 is true

C

Statement 1 is true, Statement 2 is true, Statement 2 is not a correct explanation for Statement 1

D

Statement 1 is true, Statement 2 is false

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze the function \( f(x) \) defined on the interval \([1, 3]\) with the given conditions. Let's break it down step by step. ### Step 1: Understand the function and its bounds The function \( f(x) \) is defined such that: \[ \frac{x}{[x]} \leq f(x) \leq \sqrt{6 - x} \quad \text{for all } x \neq 2 \] where \([x]\) denotes the greatest integer less than or equal to \(x\). ### Step 2: Determine the values of \([x]\) For \( x \in [1, 3] \): - When \( 1 \leq x < 2 \), \([x] = 1\) - When \( 2 < x \leq 3 \), \([x] = 2\) ### Step 3: Analyze the bounds 1. For \( 1 \leq x < 2 \): \[ \frac{x}{1} \leq f(x) \leq \sqrt{6 - x} \] This simplifies to: \[ x \leq f(x) \leq \sqrt{6 - x} \] 2. For \( 2 < x \leq 3 \): \[ \frac{x}{2} \leq f(x) \leq \sqrt{6 - x} \] This simplifies to: \[ \frac{x}{2} \leq f(x) \leq \sqrt{6 - x} \] ### Step 4: Evaluate the limits as \( x \) approaches 2 We need to find: \[ \lim_{x \to 2} f(x) \] #### From the left (as \( x \to 2^- \)): \[ x \to 2 \Rightarrow f(x) \text{ is bounded by } 2 \text{ and } \sqrt{6 - 2} = \sqrt{4} = 2 \] Thus, as \( x \to 2^- \): \[ f(x) \to 2 \] #### From the right (as \( x \to 2^+ \)): \[ x \to 2 \Rightarrow f(x) \text{ is bounded by } \frac{2}{2} = 1 \text{ and } \sqrt{6 - 2} = \sqrt{4} = 2 \] Thus, as \( x \to 2^+ \): \[ f(x) \to 2 \] ### Step 5: Conclusion for Statement 1 Since both the left-hand limit and right-hand limit as \( x \to 2 \) approach 2, we conclude: \[ \lim_{x \to 2} f(x) = 2 \] Thus, **Statement 1 is true**: \( \lim_{x \to 2} f(x) \) exists. ### Step 6: Check continuity at \( x = 2 \) For \( f \) to be continuous at \( x = 2 \), we need: \[ \lim_{x \to 2} f(x) = f(2) \] We found \( \lim_{x \to 2} f(x) = 2 \) and given \( f(2) = 1 \). Since: \[ \lim_{x \to 2} f(x) \neq f(2) \] Thus, **Statement 2 is false**: \( f \) is not continuous at \( x = 2 \). ### Final Answer - Statement 1: True - Statement 2: False

To solve the problem, we need to analyze the function \( f(x) \) defined on the interval \([1, 3]\) with the given conditions. Let's break it down step by step. ### Step 1: Understand the function and its bounds The function \( f(x) \) is defined such that: \[ \frac{x}{[x]} \leq f(x) \leq \sqrt{6 - x} \quad \text{for all } x \neq 2 \] where \([x]\) denotes the greatest integer less than or equal to \(x\). ...
Promotional Banner

Topper's Solved these Questions

  • CONTINUITY AND DIFFERENTIABILITY

    OBJECTIVE RD SHARMA ENGLISH|Exercise Exercise|87 Videos
  • CONTINUITY AND DIFFERENTIABILITY

    OBJECTIVE RD SHARMA ENGLISH|Exercise Section I - Solved Mcqs|143 Videos
  • COMPLEX NUMBERS

    OBJECTIVE RD SHARMA ENGLISH|Exercise Chapter Test|58 Videos
  • DEFINITE INTEGRALS

    OBJECTIVE RD SHARMA ENGLISH|Exercise Chapter Test 2|56 Videos

Similar Questions

Explore conceptually related problems

For a real number x, let [x] denote the greatest integer less than or equal to x. Let f: R -> R be defined as f(x)= 2x + [x]+ sin x cos x then f is

If the function f: R->R be such that f(x) = x-[x], where [x] denotes the greatest integer less than or equal to x, then f^-1(x) is

Let be a real function satisfying f(x)+f(y)=f((x+y)/(1-xy)) for all x ,y in R and xy ne1 . Then f(x) is

Le the be a real valued functions satisfying f(x+1) + f(x-1) = 2 f(x) for all x, y in R and f(0) = 0 , then for any n in N , f(n) =

If f:RrarrR is a function satisfying the property f(x+1)+f(x+3)=2" for all" x in R than f is

Let f be a real valued function satisfying f(x+y)=f(x)+f(y) for all x, y in R and f(1)=2 . Then sum_(k=1)^(n)f(k)=

Let f:R to R be a function satisfying f(x+y)=f(x)+f(y)"for all "x,y in R "If "f(x)=x^(3)g(x)"for all "x,yin R , where g(x) is continuous, then f'(x) is equal to

Let f(x) be a function satisfying the condition f(-x) = f(x) for all real x. If f'(0) exists, then its value is equal to

Let f be a real valued function satisfying f(x+y)=f(x)f(y) for all x, y in R such that f(1)=2 . Then , sum_(k=1)^(n) f(k)=

Let f:(0,oo)->R be a differentiable function such that f'(x)=2-f(x)/x for all x in (0,oo) and f(1)=1 , then