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Mathematics · 2026 · 1 mark
CBSE 2026 · Region 3 · Set 1 · Q17
Direction ratios of lines l_1 and l_2 are <12, -3, 9> and <4, q, -p> respectively. The values of p and q for which l_1 and l_2 are parallel are…
Direction ratios of lines $\displaystyle l_{1}$ and $\displaystyle l_{2}$ are $\displaystyle <12, -3, 9>$ and $\displaystyle <4, q, -p>$ respectively. The values of p and q for which $\displaystyle l_{1}$ and $\displaystyle l_{2}$ are parallel are respectively :
Official answer
(C)
$\displaystyle - 3, - 1$
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CBSE Class 12 Mathematics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.