Test: Relations & Functions- 1 - JEE MCQ

Here, 0 ≤ x- 3 ≤ 7 - x  
⇒0 ≤ x - 3 and x - 3 ≤ 7 - x
By solvation, we will get 3 ≤ x ≤ 5
So x = 3,4,5 find the values of ^7-x P_{x - 3} by substituting the values of x
at x = 3 ⁴P₀ = 1
at x = 4 ³P₁ = 3 
at x = 5 ²P₂ = 2

To be reflexive, a line must be perpendicular to itself, but which is not true. So, R is not reflexive
For symmetric, if  l₁ R l₂ ⇒ l₁ ⊥ l₂.
⇒  l₂ ⊥ l₁ ⇒ l₁ R l₂ hence symmetric
For transitive,  if l₁ R l₂ and l₂ R l₃
⇒ l₁ R l₂  and l₂ R l₃  does not imply that l₁ ⊥ l₃ hence not transitive.

Reflexive : A relation is reflexive if every element of set is paired with itself. Here none of the element of A is paired with themselves, so S is not reflexive.
Symmetric : This property says that if there is a pair (a, b) in S, then there must be a pair (b, a) in S. Since there is no pair here in S, this is trivially true, so S is symmetric.
Transitive : This says that if there are pairs (a, b) and (b, c) in S, then there must be pair (a,c) in S. Again, this condition is trivially true, so S is transitive.

The relation { } ⊂ A x A on a is surely not reflexive. However, neither symmetry nor transitivity is contradicted. So { } is a transitive and symmetry relation on A.

The domain in ordered pair (x,y) is represented by x-coordinate. Therefore, the domain of the given function is given by : {1, 3, 2}.

x - 1 ≥ 0 and 6 – x ≥ 0 ⇒ 1 ≤ x ≤ 6.

As x R y if x + 2y = 8, therefore, domain of the relation R is given by x = 8 – 2y ∈ N.
When y = 1, 
⇒ x = 6 ,when y = 2, 
⇒ x = 4, when y = 3, 
⇒ x = 2.
therefore domain is {2, 4, 6}.

We have , 

Therefore, range of f(x) is {-1}.

For even function: f(-x) = f(x) , 
therefore, f(− x)
 = sin (− x)² = sin x² = f(x).

A relation R on a non empty set A is said to be transitive if fxRy and y Rz ⇒ xRz, for all x ∈ R. Here, (1, 2) and (2, 3) belongs to R implies that (1, 3) belongs to R.

A relation R on a non empty set A is said to be transitive if fx Ry and yRz ⇒ x Rz, for all x ∈ R.

We have, f(x) = |x−1|, which always gives non-negative values of f(x) for all x ∈ R.Therefore range of the given function is all non-negative real numbers i.e. [0,∞).

7 − x ≥ 1,x − 3 ≥ 0
and 7 − x ≥ x − 3
⇒ x ≤ 6, x ≥ 3, x ≤ 5
Thus 3 ≤ x ≤ 5
∴ Range ={4P₀, 3P₁, 2P₂}
={1,3,2}

f(x) = (x+2) / |x+2|, where x ≠ -2

Step 1: Consider the Sign of (x+2)

• If x + 2 > 0 (i.e., x > -2), then |x+2| = x+2, so:

f(x) = (x+2) / (x+2) = 1

• If x + 2 < 0 (i.e., x < -2), then |x+2| = -(x+2), so:

f(x) = (x+2) / -(x+2) = -1

Since x ≠ -2, the function is defined for all values except x = -2, and the function only takes values 1 and -1.

Step 2: Determine the Range

The function only outputs two values: {1, -1}.

Option (d) {1, -1}

for some k then x = π/2k, hence sinx, sin2x,…, sin(k−1)x will lie between 0 and 1 so [sinjx] = 0 1 ≤ j ≤ k − 1;sinkx=1 so f(x) can be n+1 or n.

Correct Answer :- b

Explanation:- A = {a, b, c} and R = {(a, a), (b, b), (c, c), (b, c)}

Any relation R is reflexive if fx Rx for all x ∈ R. Here ,(a, a), (b, b), (c, c) ∈ R. Therefore , R is reflexive.

For the transitive, in the relation R there should be (a,c)

Hence it is not transitive.

f′(x) = 4x³ − 4x = 4x(x − 1)(x + 1).
The critical points of f are 0,−1,1 But f(0) = 5,f(1) = 4,f(−1) =  4,f(2) = 13.
So the range of f is [4,13] and grea, test value of f is at x=2

Clearly the range is (−∞,−5)∪[0,1]∪(5,∞)

A relation R on a non empty set A is said to be reflexive iff xRx for all x ∈ R . .
A relation R on a non empty set A is said to be symmetric if fx Ry ⇔ y Rx, for all x , y ∈ R .
A relation R on a non empty set A is said to be transitive if fx Ry and y Rz ⇒ x Rz, for all x ∈ R.
An equivalence relation satisfies all these three properties.

Hence, option (c) is correct.

Correct answer is D.

 Given,

∵ −1 ≤ cos3x ≤ 1
⇒ 1≤ − cos3x ≤ −1
⇒  2+1 ≤ 2 − cos3x ≤ 2 − 1
⇒  3 ≤ 2 − cos3x ≤ 1

∴ Range of f is [1/3,1]

A polynomial function has all exponents as integral whole numbers. 

and