CBSE · Class 6 · Mathematics · Playing with NumbersWhich of the following pairs of numbers are co-prime?
Step-by-Step Solution
The correct answer is 4 and 15.
Explanation:
- Two numbers are co-prime if their Highest Common Factor (HCF) is 1.
- Factors of 4 = 1, 2, 4
- Factors of 15 = 1, 3, 5, 15
- Common factor = 1. Hence, HCF = 1. Thus, 4 and 15 are co-prime.
Detailed Options Breakdown
Option : 4 and 15 (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 1: 6 and 12
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Playing with Numbers.
Option 2: 15 and 20
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Playing with Numbers.
Option 3: 9 and 27
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Playing with Numbers.
💡 Study Guide: This question tests core syllabus concepts from Playing with Numbers. For formulas, key summaries, and mock exam reference guides, read the full Playing with Numbers Revision Notes.