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JEE Mains · Maths · STD 12 - 10. vector algebra

ધારોકે \(\vec{a}=\vec{i}-\alpha \vec{j}+\beta \hat{k}, \vec{b}=3 \hat{i}+\beta \hat{j}-\alpha \hat{k}\) અને \(\vec{c}=-\alpha \hat{i}-2 \hat{j}+\hat{k}\), કે જ્યાં \(\alpha\) અને \(\beta\) એ પૃણાંક છે.જો  \(\vec{a} \cdot \vec{b}=-1\) અને \(\overrightarrow{\mathrm{b}} \cdot \overrightarrow{\mathrm{c}}=10\) હોય તો  \((\overrightarrow{\mathrm{a}} \times \overrightarrow{\mathrm{b}}) \cdot \overrightarrow{\mathrm{c}}\) ની કિમંત મેળવો.

  1. A \(8\)
  2. B \(5\)
  3. C \(9\)
  4. D \(1\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(9\)

Step-by-step Solution

Detailed explanation

\(\vec{a}=(1,-\alpha, \beta)\) \(\vec{b}=(3, \beta,-\alpha)\) \(\vec{c}=(-\alpha,-2,1) ; \alpha, \beta \in I\) \(\vec{a} \vec{b}=-1 \Rightarrow 3-\alpha \beta-\alpha \beta=-1\) \(\Rightarrow \alpha \beta=2\) \(\vec{b} \cdot \vec{c}=10\) \(\Rightarrow-3 \alpha-2 \beta-\alpha=10\)…
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