Teacher Anjali assigns a unique roll number to every student in her Class 12 batch. The function mapping a student to their roll number is:
Teacher Anjali assigns a unique roll number to every student in her Class 12 batch. The function mapping a student to their roll number is:
- A. Injective (One-one)
- B. Surjective (Onto)
- C. Constant
- D. Many-one
Answer: A) Injective (One-one)
Explanation: Each student gets a distinct roll number, so f(x₁) = f(x₂) implies x₁ = x₂. Thus, the function is injective. It is not necessarily surjective if some roll numbers are left unassigned.
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