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Mathematics · 2023 · 1 mark
CBSE 2023 · Region 6 · Set 1 · Q18
If the sum of the first n terms of an A.P be 3 n^2+ n and its common difference is 6, then its first term is
If the sum of the first n terms of an A.P be $\displaystyle 3 \mathrm{n}^{2}+\mathrm{n}$ and its common difference is $\displaystyle 6$ , then its first term is
Official answer
(D)
$\displaystyle 4$
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CBSE Class 10 Mathematics past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.