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Mathematics · 2022 · 2 marks
CBSE 2022 · Region 1 · Set 3 · Q3
(a) Find the sum of the first twelve 2-digit numbers which are multiples of 6.
(a)
Find the sum of the first twelve $\displaystyle 2$-digit numbers which are multiples of 6.
OR
(b)
In an AP, if $\displaystyle \mathrm{a}_{2}=26$ and $\displaystyle \mathrm{a}_{15}=-26$, then write the AP.
Marking-scheme solution
Here \(\displaystyle a=12, d=6, n=12\)
\[\begin{aligned}
S_{12} & =\frac{12}{2}[24+11 \times 6] \\
& =540 \\
\text { Or } &
\end{aligned}
\]
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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.