Comprehension

निर्देश: निम्नलिखित प्रश्नों के लिए निम्नलिखित को ध्यान में रखें:

माना L : x + y + z + 4 = 0 = 2x - y - z + 8 एक रेखा है और P : x + 2y + 3z + 1 = 0 एक समतल है। 

रेखा के दिक् अनुपात क्या हैं?

This question was previously asked in
NDA-II 2024 (Maths) Official Paper (Held On: 01 Sept, 2024)
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  1. 〈2, 1, -1〉
  2. 〈0, -1, 2〉
  3. 〈0, 1, -1〉
  4. 〈2, 3, -3〉

Answer (Detailed Solution Below)

Option 3 : 〈0, 1, -1〉
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NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

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व्याख्या:

दिया गया है:

L = x + y + z + 4 = 0 = 2x - y - z + 8 और

P = x + 2y + 3z + 1 = 0 एक समतल है।

⇒ माना रेखा के दिक् अनुपात (a, b, c) हैं

चूँकि रेखा समतलों के प्रतिच्छेदन से प्राप्त होती है।

⇒ x + y + z + 4 = 0 और 2x - y - z + 8 = 0

इसलिए a + b + c = 0....(i)

⇒ 2a - b - c = 0...(ii)

(i) और (ii) को हल कीजिए

⇒ a = 0, b = 3λ और c = -3λ

रेखा के दिक् अनुपात (0, 3, -3) या (0, 1, -1) हैं।

∴ विकल्प (c) सही है।

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