Q. If f: A → B is a function and |A| = 5, |B| = 3, what is the maximum number of distinct functions f?
A.
3^5
B.
5^3
C.
15
D.
8
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.
Q. If G = {1, 2, 3}, how many subsets contain the element '1'?
A.
2
B.
4
C.
6
D.
8
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'.
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
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.
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
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.
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
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.
Understanding "Sets, Relations & Functions" is crucial for students aiming to excel in their exams. This topic forms the foundation of many mathematical concepts and is frequently tested in various assessments. Practicing MCQs and objective questions not only enhances your grasp of the subject but also boosts your confidence in tackling important questions during exams.
What You Will Practise Here
Basic definitions and properties of sets
Types of relations and their characteristics
Functions: definitions, types, and notations
Operations on sets: union, intersection, and difference
Venn diagrams and their applications
Domain, range, and co-domain of functions
Important theorems related to sets and functions
Exam Relevance
The topic of "Sets, Relations & Functions" is integral to the curriculum of CBSE, State Boards, and competitive exams like NEET and JEE. You can expect questions that require you to apply concepts in problem-solving scenarios. Common question patterns include identifying properties of sets, solving problems involving relations, and interpreting functions graphically. Mastery of this topic can significantly enhance your performance in both objective and subjective formats.
Common Mistakes Students Make
Confusing the definitions of sets and subsets
Misunderstanding the types of relations (reflexive, symmetric, transitive)
Overlooking the importance of domain and range in functions
Errors in Venn diagram representations
Neglecting to apply the correct operations on sets
FAQs
Question: What are the different types of sets? Answer: The different types of sets include finite sets, infinite sets, equal sets, null sets, and singleton sets.
Question: How do I determine the domain and range of a function? Answer: The domain is the set of all possible input values, while the range is the set of all possible output values based on the function's definition.
Start solving practice MCQs today to solidify your understanding of "Sets, Relations & Functions". Testing your knowledge with objective questions will prepare you for success in your exams!
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