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Real Numbers
RD Sharma
CBSE
Grade 10

Question:

If $\text{HCF}(a, b) = 1$, then $a$ and $b$ are called:
(a) Composite numbers
(b) Coprime numbers
(c) Twin prime numbers
(d) Even numbers

Step-by-Step Solution

Key Concept: Definition of coprime numbers.
Numbers with $\text{HCF} = 1$ are coprime numbers. [1.0 Mark]

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🎯 Official CBSE Marking Scheme:
Recalling definition: 1.0 Mark

Correct Answer: Coprime numbers
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