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JEE Mains · Maths · STD 11 - 4.2 Quadratic equations and inequations

यदि समीकरण, \(x ^{2}+5(\sqrt{2}) x +10=0\), के \(\alpha\) तथा \(\beta\), \(\alpha>\beta\) दो मूल है तथा \(P_{n}=\alpha^{n}-\beta^{n}\),( प्रत्येक धन पूर्णांक \(n\) के लिए) है, तो \(\left(\frac{ P _{17} P _{20}+5 \sqrt{2} P _{17} P _{19}}{ P _{18} P _{19}+5 \sqrt{2} P _{18}^{2}}\right)\) का मान है ............. |

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

Correct Answer

(D) \(1\)

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Detailed explanation

\(x^{2}+5 \sqrt{2} x+10=0\) \(\& p_{n}=\alpha^{n}-\beta^{n} \text { (Given) }\) \(\text { Now } \frac{P_{17} P_{20}+5 \sqrt{2} p_{11} P_{19}}{P_{18} P_{19}+5 \sqrt{2} P_{18}^{2}}=\frac{P_{17}\left(P_{20} 5 \sqrt{2} P_{19}\right)}{P_{18}\left(P_{19}+5 \sqrt{2 P}_{18}\right)}\)…
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