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

माना \(\left(\mathrm{x}-\frac{3}{\mathrm{x}^2}\right)^{\mathrm{n}}, \mathrm{x} \neq 0, \mathrm{n} \in \mathrm{N}\), के प्रसार में प्रथम तीन पदों के गुणांको का योग 376 है। तो \(\mathrm{x}^4\) का गुणांक ___________ है।

  1. A \(404\)
  2. B \(403\)
  3. C \(402\)
  4. D \(405\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(405\)

Step-by-step Solution

Detailed explanation

Given Binomial \(\left(x-\frac{3}{x^2}\right)^n, x \neq 0, n \in N\) Sum of coefficients of first three terms \({ }^n C_0-{ }^n C_1 \cdot 3+{ }^n C_2 3^2=376\) \(\Rightarrow 3 n^2-5 n-250=0\) \(\Rightarrow(n-10)(3 n+25)=0\) \(\Rightarrow n =10\) Now general term…
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