CUET · MATHS · PYQ PAPER 2025
If \(\vec{a}=3 \hat{i}-6 \hat{j}+\hat{k}\) and \(\vec{b}=2 \hat{i}-4 \hat{j}+\lambda \hat{k}\) are such that \(\vec{a} \| \vec{b}\), then \(3 \lambda+2=\)
- A \(0\)
- B 2
- C 4
- D 6
Answer & Solution
Correct Answer
(C) 4
Step-by-step Solution
Detailed explanation
\( \vec{a} \parallel \vec{b} \Rightarrow \frac{3}{2} = \frac{-6}{-4} = \frac{1}{\lambda} \) \( \frac{3}{2} = \frac{1}{\lambda} \Rightarrow 3\lambda = 2 \Rightarrow \lambda = \frac{2}{3} \) \( 3\lambda+2 = 3\left(\frac{2}{3}\right)+2 = 2+2 = 4 \)
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