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

यदि \(\overrightarrow{ a }=2 \hat{ i }+\hat{ j }+3 \hat{ k }, \quad \overrightarrow{ b }=3 \hat{ i }+3 \hat{ j }+\hat{ k }\) तथा \(\overrightarrow{ c }= c _1 \hat{ i }+ c _2 \hat{ j }+ c _3 \hat{ k }\) समतलीय सदिश है और \(\overrightarrow{ a } \cdot \overrightarrow{ c }=5, \overrightarrow{ b } \perp \overrightarrow{ c }\) है, तब \(122\left( c _1+ c _2+ c _3\right)\) बराबर है।

  1. A \(150\)
  2. B \(157\)
  3. C \(159\)
  4. D \(190\)
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Answer & Solution

Correct Answer

(A) \(150\)

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Detailed explanation

\(\overline{ a } \cdot \overline{ c }=5 \Rightarrow 2 c _{1}+ c _{2}+3 c _{3}=5\)..........\((1)\) \(\overline{ b } \cdot \overline{ c }=0 \Rightarrow 3 c _{1}+3 c _{2}+ c _{3}=0\).............\((2)\) And…
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