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Ex 1.4, 7 - Chapter 1 Class 12 Relation and Functions
Last updated at August 2, 2026 by Teachoo
Chapter 1 Class 12 Relation and Functions
Concept wise
- Relations - Definition
- Empty and Universal Relation
- To prove relation reflexive, transitive, symmetric and equivalent
- Finding number of relations
- Function - Definition
- To prove one-one & onto (injective, surjective, bijective)
- Composite functions
- Composite functions and one-one onto
- Finding Inverse
- Inverse of function: Proof questions
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Binary Operations - Definition
- Whether binary commutative/associative or not
- Binary operations: Identity element
- Binary operations: Inverse
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Transcript
Ex 1.4, 7 Is * defined on the set {1, 2, 3, 4, 5} by a * b = L.C.M. of a and b a binary operation? Justify your answer. a * b = LCM of a & b Here a, b ∈ {1, 2, 3, 4, 5} Let a = 2, b = 3 a * b = 2 * 3 = LCM of 2 & 3 = 6 Since 6 is not in set {1, 2, 3, 4, 5} So, * is not a binary operation
