CBSE 2025 · Region 1 · Set 2 · Q2 · 1 mark
If $\displaystyle \vec{\alpha}=\hat{i}-4 \hat{j}+9 \hat{k}$ and $\displaystyle \vec{\beta}=2 \hat{i}-8 \hat{j}+\lambda \hat{k}$ are two mutually parallel vectors, then $\displaystyle \lambda$ is equal to:
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle 18$
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CBSE Class 12 Mathematics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.