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

\(\left(1-x+2 x^3\right)^{10}\) में \(\mathrm{x}^7\) का गुणांक है_________

  1. A \(960\)
  2. B \(950\)
  3. C \(940\)
  4. D \(960\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(960\)

Step-by-step Solution

Detailed explanation

\(\text { General term }=\frac{10 !}{r_{1} ! \cdot r_{2} ! \cdot r_{3} !}(-1)^{r_2} \cdot(2)^{r_3} x^{r_2+3 r_3}\) where \(r_1+r_2+r_3=10\) and \(r_2+3 r_3=7\) \(\begin{array}{lll}r_1 & r_2 & r_3 \\ 3 & 7 & 0 \\ 5 & 4 & 1 \\ 7 & 1 & 2\end{array}\) Required coefficient…
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