Sets, Relations & Functions
Q. If f: A → B is a function and |A| = 5, |B| = 3, what is the maximum number of distinct functions that can be formed?
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Solution
The maximum number of distinct functions is |B|^|A| = 3^5 = 243.
Correct Answer: A — 3^5
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Q. If f: A → B is a function and |A| = 5, |B| = 3, what is the maximum number of distinct functions f?
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Solution
The number of distinct functions from set A to set B is given by |B|^|A|. Here, |B| = 3 and |A| = 5, so the maximum number of distinct functions is 3^5 = 243.
Correct Answer: A — 3^5
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Q. If G = {1, 2, 3, 4, 5}, how many subsets have exactly 3 elements?
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Solution
The number of ways to choose 3 elements from 5 is given by the combination formula C(5, 3) = 10.
Correct Answer: A — 10
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Q. If G = {1, 2, 3, 4, 5}, what is the total number of subsets of G?
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Solution
The number of subsets of a set with n elements is 2^n. Here, n = 5, so 2^5 = 32.
Correct Answer: A — 32
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Q. If G = {1, 2, 3}, how many subsets contain the element '1'?
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Solution
The subsets containing '1' can be formed by including '1' and choosing from the remaining elements {2, 3}. There are 2^2 = 4 subsets, but we need to exclude the empty subset, so there are 4 - 1 = 3 subsets containing '1'.
Correct Answer: C — 6
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Q. If G = {1, 2, 3}, how many subsets of G have exactly 2 elements?
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Solution
The subsets with exactly 2 elements are {1, 2}, {1, 3}, and {2, 3}. So, there are 3 such subsets.
Correct Answer: C — 5
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Q. If G = {x, y, z}, how many subsets contain exactly 2 elements?
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Solution
The subsets containing exactly 2 elements are {x, y}, {x, z}, and {y, z}. So, there are 3 such subsets.
Correct Answer: A — 3
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Q. If G = {x, y}, what is the number of subsets of G?
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Solution
The number of subsets of a set with n elements is 2^n. Here, n=2, so the number of subsets is 2^2 = 4.
Correct Answer: C — 4
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Q. If g(x) = 3x + 2, what is g(-1)?
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Solution
g(-1) = 3(-1) + 2 = -3 + 2 = -1.
Correct Answer: A — -1
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Q. If H = {1, 2, 3}, how many subsets of H have exactly 2 elements?
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Solution
The number of ways to choose 2 elements from 3 is given by the combination formula C(3, 2) = 3.
Correct Answer: B — 6
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Q. If H = {x, y, z}, how many subsets of H have at least one element?
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Solution
The total number of subsets is 2^3 = 8. Subtracting the empty set gives 8 - 1 = 7.
Correct Answer: A — 7
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Q. If H = {x, y}, how many subsets of H are also subsets of the power set of H?
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Solution
The power set of H is {∅, {x}, {y}, {x, y}}. The subsets of H are {∅, {x}, {y}}.
Correct Answer: C — 4
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Q. If h(x) = x^3 - 3x + 2, what is the critical point?
A.
x = 0
B.
x = 1
C.
x = -1
D.
x = 2
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Solution
h'(x) = 3x^2 - 3 = 0 gives x^2 = 1, so x = 1 and x = -1 are critical points.
Correct Answer: B — x = 1
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Q. If h(x) = x^3 - 3x + 2, what is the value of h(1)?
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Solution
h(1) = 1^3 - 3(1) + 2 = 1 - 3 + 2 = 0.
Correct Answer: A — 0
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Q. If h(x) = x^3 - 3x, what is the value of h(1)?
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Solution
h(1) = 1^3 - 3*1 = 1 - 3 = -2.
Correct Answer: B — 0
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Q. If K = {a, b, c}, what is the number of subsets of K that do not contain the element 'a'?
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Solution
If 'a' is excluded, we can form subsets from {b, c}, which has 2^2 = 4 subsets.
Correct Answer: C — 3
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Q. If R is a relation defined on set A = {1, 2, 3} such that R = {(1, 2), (2, 3)}, is R a function?
A.
Yes
B.
No
C.
Depends on A
D.
Not enough information
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Solution
A relation is a function if every element in the domain (set A) maps to exactly one element in the codomain. Here, 1 maps to 2, and 2 maps to 3, but 3 has no mapping, so R is not a function.
Correct Answer: B — No
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Q. If R is a relation on set A = {1, 2, 3} defined by R = {(1, 1), (2, 2), (3, 3)}, is R reflexive?
A.
Yes
B.
No
C.
Depends on A
D.
None of the above
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Solution
A relation R is reflexive if every element in set A is related to itself. Since R contains (1, 1), (2, 2), and (3, 3), R is reflexive.
Correct Answer: A — Yes
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Q. If R is a relation on set A = {1, 2, 3} defined by R = {(1, 2), (2, 3)}, is R transitive?
A.
Yes
B.
No
C.
Not enough information
D.
None of the above
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Solution
A relation R is transitive if whenever (a, b) ∈ R and (b, c) ∈ R, then (a, c) must also be in R. Here, (1, 2) and (2, 3) are in R, but (1, 3) is not, so R is not transitive.
Correct Answer: B — No
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Q. If R is a relation on the set A = {1, 2, 3} defined by R = {(1, 2), (2, 3), (3, 1)}, which of the following properties does R possess?
A.
Reflexive
B.
Symmetric
C.
Transitive
D.
All of the above
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Solution
R is not reflexive as (1,1), (2,2), (3,3) are not in R. It is symmetric as (2,3) implies (3,2) is not in R. It is transitive as (1,2) and (2,3) implies (1,3) is not in R. Thus, R is not all of the above.
Correct Answer: C — Transitive
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Q. If R is a relation on the set {1, 2, 3, 4} defined by R = {(1, 1), (2, 2), (3, 3), (4, 4), (1, 2), (2, 1)}, what type of relation is R?
A.
Reflexive
B.
Symmetric
C.
Transitive
D.
Both reflexive and symmetric
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Solution
R is reflexive because it contains all pairs (a, a) and symmetric because (1,2) implies (2,1).
Correct Answer: D — Both reflexive and symmetric
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Q. If R is a relation on the set {1, 2, 3} defined by R = {(1, 1), (2, 2), (3, 3), (1, 2)}, is R a partial order?
A.
Yes
B.
No
C.
Only reflexive
D.
Only transitive
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Solution
R is not a partial order because it is not transitive; (1,2) and (2,2) do not imply (1,2).
Correct Answer: B — No
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Q. If R is a relation on the set {1, 2, 3} defined by R = {(1, 1), (2, 2), (3, 3), (1, 2), (2, 1)}, which of the following is true?
A.
R is reflexive
B.
R is symmetric
C.
R is transitive
D.
Both 1 and 2
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Solution
R is reflexive and symmetric, but not transitive. Thus, both 1 and 2 are true.
Correct Answer: D — Both 1 and 2
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Q. If R is a relation on the set {a, b, c} defined by R = {(a, b), (b, c)}, what can be said about R?
A.
Reflexive
B.
Symmetric
C.
Transitive
D.
None of the above
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Solution
R is neither reflexive, symmetric, nor transitive as it does not satisfy any of the properties.
Correct Answer: D — None of the above
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Q. If R is a relation on the set {a, b, c} defined by R = {(a, b), (b, c)}, which property does R NOT have?
A.
Reflexive
B.
Symmetric
C.
Transitive
D.
None of the above
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Solution
R is not symmetric as (b,c) does not imply (c,b) is in R. It is reflexive and transitive.
Correct Answer: B — Symmetric
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Q. If R is a relation on the set {x, y, z} defined by R = {(x, y), (y, z), (z, x)}, what can be said about R?
A.
Reflexive
B.
Symmetric
C.
Transitive
D.
None of the above
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Solution
R is neither reflexive, symmetric, nor transitive.
Correct Answer: D — None of the above
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Q. If the relation R on set A = {1, 2, 3} is defined as R = {(1, 1), (2, 2), (3, 3)}, is R reflexive?
A.
Yes
B.
No
C.
Only for 1
D.
Only for 2
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Solution
A relation is reflexive if every element in the set is related to itself. Here, R includes (1, 1), (2, 2), and (3, 3), so R is reflexive.
Correct Answer: A — Yes
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Q. If x = cos^(-1)(-1/2), what is the value of x?
A.
π/3
B.
2π/3
C.
π/4
D.
π/6
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Solution
x = cos^(-1)(-1/2) = 2π/3
Correct Answer: B — 2π/3
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Q. If x = cos^(-1)(1/2), then the value of sin(x) is:
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Solution
If x = cos^(-1)(1/2), then x = π/3. Therefore, sin(x) = sin(π/3) = √3/2.
Correct Answer: B — √3/2
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Q. If x = cos^(-1)(1/2), then what is the value of sin(x)?
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Solution
If x = cos^(-1)(1/2), then cos(x) = 1/2, which corresponds to x = π/3. Therefore, sin(x) = sin(π/3) = √3/2.
Correct Answer: B — √3/2
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