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Mathematics · 2025 · 1 mark
CBSE 2025 · Region 5 · Set 1 · Q20
Assertion (A) : For an A.P., $\displaystyle 3,6,9, \ldots, 198,10^{\text {th }}$ term from the end is 168.
Reason (R) : If 'a' and ' $\displaystyle l$ ' are the first term and last term of an A.P. with common difference ' d ', then $\displaystyle \mathrm{n}^{\text {th }}$ term from the end of the given A.P. is $\displaystyle l-(\mathrm{n}-1) \mathrm{d}$.
Official answer
From CBSE’s own marking scheme for this paper.
(D)
Assertion (A) is false, but Reason (R) is true.
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CBSE Class 10 Mathematics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.