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Mathematics · 2022 · 2 marks
CBSE 2022 · Region 3 · Set 3 · Q3
Find the common difference 'd' of an AP whose first term is 10 and the sum of the first 14 terms is 1505.
Find the common difference 'd' of an AP whose first term is $\displaystyle 10$ and the sum of the first $\displaystyle 14$ terms is 1505.
Marking-scheme solution
Here \(\displaystyle a=10, n=14, \mathrm{~S}_{14}=1505\)
\(\displaystyle 1505=\frac{14}{2}[20+13 d]\)
\(\displaystyle \Rightarrow d=15\)
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CBSE Class 10 Mathematics past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.