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

माना \(P _{1}, P _{2}, \ldots, P _{15}\) एक वत्त पर \(15\) बिन्दु हैं। बिन्दुओं \(P _{ i }, P _{ j }, P _{ k }\) जिनके लिए \(i + j + k \neq 15\), से बनने वाले भिन्न त्रिभुजों की संख्या है

  1. A \(12\)
  2. B \(419\)
  3. C \(443\)
  4. D \(455\)
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Answer & Solution

Correct Answer

(C) \(443\)

Step-by-step Solution

Detailed explanation

Total Number of Triangles \(={ }^{15} \mathrm{C}_{3}\) \(\mathrm{i}+\mathrm{j}+\mathrm{k}=15 \text { (Given) }\) \([Image]\) Number of Possible triangles using the vertices \(\mathrm{P}_{\mathrm{i}}, \mathrm{P}_{\mathrm{j}}\) \(P_{k}\) such that \(i+j+k \neq 15\) is equal to…
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