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JEE Mains · Maths · STD 11 - 7. binomial theoram

माना \(\alpha, \beta, \gamma\) तथा \(\delta\) क्रमशः \(x^7, x^5, x^3\) और \(x\) के गुणांक हैं, व्यंजक \(\left(x+\sqrt{x^3-1}\right)^5+\left(x-\sqrt{x^3-1}\right)^5, x\gt1\) के प्रसार में। यदि u और v समीकरणों को संतुष्ट करते हैं
\(\begin{aligned}
& \alpha u+\beta v=18 \\
& \gamma u+\delta v=20
\end{aligned}\)
तब \(u+v\) = __________

  1. A 5
  2. B 3
  3. C 4
  4. D 8
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Answer & Solution

Correct Answer

(A) 5

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Detailed explanation

\(\left(x+\sqrt{x^3-1}\right)^5+\left(x-\sqrt{x^3-1}\right)^5 \) \( -\left[{ }^5 C_0 x^5+{ }^5 C_1 x^4\left(\sqrt{x^3-1}\right)+\ldots \ldots+{ }^5 C_5\left(\sqrt{x^3-1}\right)^5\right]+ \)…
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