CBSE 2026 · Region 5 · Set 1 · Q17 · 1 mark

If vectors $\displaystyle \overrightarrow{\mathrm{a}}=3 \hat{\mathrm{i}}+2 \hat{\mathrm{j}}+\lambda \hat{\mathrm{k}}$ and $\displaystyle \overrightarrow{\mathrm{b}}=2 \hat{\mathrm{i}}-4 \hat{\mathrm{j}}+5 \hat{\mathrm{k}}$, represent the two strips of the Red Cross sign placed outside a doctor's clinic, then the value of $\displaystyle \lambda$ is :

CBSE Class 12 Mathematics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.