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JEE Mains · Maths · STD 11 - 6. permutation and combination

त्रिकों \((\mathrm{x}, \mathrm{y}, \mathrm{z})\), जहाँ \(\mathrm{x}, \mathrm{y}, \mathrm{z}\) भिन्न ऋणोत्तर पूर्णांक हैं तथा \(\mathrm{x}+\mathrm{y}+\mathrm{z}=15\) को संतुष्ट करते हैं, की संख्या है :

  1. A \(80\)
  2. B \(114\)
  3. C \(92\)
  4. D \(136\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(114\)

Step-by-step Solution

Detailed explanation

\(x+y+z=15\) Total no. of solution \(={ }^{15+3-1} C _{3-1}=136\) Let \(x = y \neq z\) \(2 x + z =15 \Rightarrow z =15-2 t\) \(\Rightarrow r \in\{0,1,2, \ldots 7\}-\{5\}\) \(\therefore 7 \text { solutions }\) \(\therefore 7\) solutions \(\therefore\) there are 21 solutions in…
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