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

माना\((2+a+b) \hat{i}+(a+2 b+c) \hat{j}-(b+c) \hat{k}\) \((1+b) \hat{i}+2 b \hat{j}-b \hat{k}\) तथा \((2+b) \hat{i}+2 b \hat{j}+(1-b) \hat{k}, a, b \text {, }\) \(c \in R\) सहतलीय सदिश है। तो निम्न में से कौन-सा कथन सही है ?

  1. A \(2 \mathrm{a}=\mathrm{b}+\mathrm{c}\)
  2. B \(2 \mathrm{~b}=\mathrm{a}+\mathrm{c}\)
  3. C \(3 \mathrm{c}=\mathrm{a}+\mathrm{b}\)
  4. D \(\mathrm{a}=\mathrm{b}+2 \mathrm{c}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(2 \mathrm{~b}=\mathrm{a}+\mathrm{c}\)

Step-by-step Solution

Detailed explanation

If the vectors are co-planner, \( \left|\begin{array}{ccc} a+b+2 & a+2 b+c & c b-c \\ b+1 & 2 b & -b \\ b+2 & 2 b & 1-b \end{array}\right|=0 \) Now \(R _{3} \rightarrow R _{3}- R _{2}, R _{1} \rightarrow R _{1}- R _{2}\) So…
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