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

माना बिंदु \((2,3,5)\) का रेखा \(\frac{x-1}{2}-\frac{y-2}{3}-\frac{z-3}{4}\) में दर्पण प्रतिबिंब \((\alpha, \beta, \gamma)\) है। तो \(2 \alpha+3 \beta+4 \gamma\) = ........... है।

  1. A \(32\)
  2. B \(33\)
  3. C \(31\)
  4. D \(34\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(33\)

Step-by-step Solution

Detailed explanation

\(\because \overrightarrow{\mathrm{PR}} \perp(2,3,4) \) \(\therefore \overrightarrow{\mathrm{PR}} \cdot(2,3,4)=0 \) \((\alpha-2, \beta-3, \gamma-5) \cdot(2,3,4)=0 \) \(\Rightarrow 2 \alpha+3 \beta+4 \gamma=4+9+20=33\)
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