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Mathematics · 2025 · 1 mark
CBSE 2025 · Region 6 · Set 2 · Q19
Assertion (A): For two prime numbers x and y (x< y ), HCF (x, y )=x and LCM (x, y )= y. Reason (R): HCF (x, y ) ≤ LCM (x, y ), where x, y are any two…
Assertion (A) : For two prime numbers $\displaystyle x$ and $\displaystyle \mathrm{y}(x<\mathrm{y}), \operatorname{HCF}(x, \mathrm{y})=x$ and $\displaystyle \operatorname{LCM}(x, \mathrm{y})=\mathrm{y}$.
Reason (R) : $\displaystyle \operatorname{HCF}(x, \mathrm{y}) \leq \operatorname{LCM}(x, \mathrm{y})$, where $\displaystyle x$, y are any two natural numbers.
Official answer
(D)
Assertion (A) is false, but Reason (R) is true.
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CBSE Class 10 Mathematics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.