English

The function f(x) = [x], where [x] denotes the greatest integer less than or equal to x; is continuous at ______.

Advertisements
Advertisements

Question

The function f(x) = [x], where [x] denotes the greatest integer less than or equal to x; is continuous at ______.

Options

  • x = 1

  • x = 1.5

  • x = – 2

  • x = 1

MCQ
Fill in the Blanks
Advertisements

Solution

The function f(x) = [x], where [x] denotes the greatest integer less than or equal to x; is continuous at x = 1.5.

Explanation:

We know that the biggest integer function is continuous only on non-integral points, not on integers.

shaalaa.com
  Is there an error in this question or solution?
2022-2023 (March) Delhi Set 1

RELATED QUESTIONS

Let A and B be sets. Show that f : A × B → B × A such that f(a, b) = (b, a) is bijective function.


Let S = {abc} and T = {1, 2, 3}. Find F−1 of the following functions F from S to T, if it exists.

F = {(a, 3), (b, 2), (c, 1)} 


Classify the following function as injection, surjection or bijection :

f : Z → Z, defined by f(x) = x2 + x


Give examples of two surjective functions f1 and f2 from Z to Z such that f1 + f2 is not surjective.


Find gof and fog when f : R → R and g : R → R is defined by  f(x) = x2 + 8 and g(x) = 3x3 + 1 .


If f : A → B and g : B → C are onto functions, show that gof is a onto function.


Find fog and gof  if : f(x)= x + 1, g (x) = 2x + 3 .


Find fog and gof  if : f(x) = c, c ∈ R, g(x) = sin `x^2`


 If f, g : R → R be two functions defined as f(x) = |x| + x and g(x) = |x|- x, ∀x∈R" .Then find fog and gof. Hence find fog(–3), fog(5) and gof (–2).


State with reason whether the following functions have inverse:

h : {2, 3, 4, 5} → {7, 9, 11, 13} with h = {(2, 7), (3, 9), (4, 11), (5, 13)}


Consider the function f : R→  [-9 , ∞ ]given by f(x) = 5x2 + 6x - 9. Prove that f is invertible with -1 (y) = `(sqrt(54 + 5y) -3)/5`             [CBSE 2015]


Let A and B be two sets, each with a finite number of elements. Assume that there is an injective map from A to B and that there is an injective map from B to A. Prove that there is a bijection from A to B.


Which one of the following graphs represents a function?


Write the total number of one-one functions from set A = {1, 2, 3, 4} to set B = {abc}.


If f : C → C is defined by f(x) = (x − 2)3, write f−1 (−1).


If f : {5, 6} → {2, 3} and g : {2, 3} → {5, 6} are given by f = {(5, 2), (6, 3)} and g = {(2, 5), (3, 6)}, then find fog.    [NCERT EXEMPLAR]


Which one the following relations on A = {1, 2, 3} is a function?
f = {(1, 3), (2, 3), (3, 2)}, g = {(1, 2), (1, 3), (3, 1)}                                                                                                        [NCERT EXEMPLAR]


\[f : R \to R \text{given by} f\left( x \right) = x + \sqrt{x^2} \text{ is }\]

 

 


The inverse of the function

\[f : R \to \left\{ x \in R : x < 1 \right\}\] given by

\[f\left( x \right) = \frac{e^x - e^{- x}}{e^x + e^{- x}}\] is 

 


Mark the correct alternative in the following question:

Let f : → R be given by f(x) = tanx. Then, f-1(1) is

 

 


Mark the correct alternative in the following question:
Let f : R→ R be defined as, f(x) =  \[\begin{cases}2x, if x > 3 \\ x^2 , if 1 < x \leq 3 \\ 3x, if x \leq 1\end{cases}\] 

Then, find f( \[-\]1) + f(2) + f(4)

 


Set A has 3 elements and the set B has 4 elements. Then the number of injective mappings that can be defined from A to B is ______.


Let f: R → R be the function defined by f(x) = 2x – 3 ∀ x ∈ R. write f–1 


If f(x) = (4 – (x – 7)3}, then f–1(x) = ______.


The domain of the function `"f"("x") = 1/(sqrt ({"sin x"} + {"sin" ( pi + "x")}))` where {.} denotes fractional part, is


Raji visited the Exhibition along with her family. The Exhibition had a huge swing, which attracted many children. Raji found that the swing traced the path of a Parabola as given by y = x2.

Answer the following questions using the above information.

  • Let f: R → R be defined by f(x) = x2 is:

Raji visited the Exhibition along with her family. The Exhibition had a huge swing, which attracted many children. Raji found that the swing traced the path of a Parabola as given by y = x2.

Answer the following questions using the above information.

  • The function f: Z → Z defined by f(x) = x2 is ____________.

Prove that the function f is surjective, where f: N → N such that `f(n) = {{:((n + 1)/2",", if "n is odd"),(n/2",", if  "n is even"):}` Is the function injective? Justify your answer.


Let A = {1, 2, 3, ..., 10} and f : A `rightarrow` A be defined as

f(k) = `{{:(k + 1, if k  "is odd"),(     k, if k  "is even"):}`.

Then the number of possible functions g : A `rightarrow` A such that gof = f is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×