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

व्यंजक \((1+x)^{10}+x(1+x)^{9}+x^{2}(1+x)^{8}+\ldots+x^{10}\) में \(x ^{7}\) का गुणांक है :

  1. A \(120\)
  2. B \(330\)
  3. C \(210\)
  4. D \(420\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(330\)

Step-by-step Solution

Detailed explanation

Coefficient of \(x^{7}\) is \(^{10} \mathrm{C}_{7}+^{9} \mathrm{C}_{6}+^{5} \mathrm{C}_{5}+\ldots+^{4} \mathrm{C}_{1}+^{3} \mathrm{C}_{0}\) \(\underbrace{^{4} C_{0}+^{4} C_{1}}_{^{5} C_{1}}+^{5} C_{2}+\ldots+^{10} C_{7}=^{11} C_{7}=330\)
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app