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JEE Mains · Maths · STD 12 - 11. three dimension geometry

यदि समतल \(P\) का समीकरण, जो समतलों \(x +4 y - z +\) \(7=0\) तथा \(3 x + y +5 z =8\) के प्रतिच्छेदन से गुजरता है, किसी \(a , b \in R\) के लिये \(ax + by +6 z =15\) हो, तो समतल \(P\) से बिन्दु \((3,2,-1)\) की दूरी होगी

  1. A \(3\)
  2. B \(7\)
  3. C \(21\)
  4. D \(63\)
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Answer & Solution

Correct Answer

(A) \(3\)

Step-by-step Solution

Detailed explanation

\(D _{1}=\left|\begin{array}{ccc}-7 & 4 & -1 \\ 8 & 1 & 5 \\ 15 & b & 6\end{array}\right|=0 \Rightarrow b =-3\) \(D=\left|\begin{array}{ccc}1 & 4 & -1 \\ 3 & 1 & 5 \\ a & b & 6\end{array}\right|=0 \Rightarrow 21 a-8 b-66=0 \ldots\) \(P: 2 x-3 y+6 z=15\) so required distance…
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