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

यदि \({ }^{20} C _{1}+\left(2^{2}\right){ }^{20} C _{2}+\left(3^{2}\right){ }^{20} C _{3}+\ldots \ldots+\) \(\left(20^{2}\right)^{20} C _{20}= A \left(2^{\beta}\right)\), तो क्रमित युग्म \(( A , \beta)\) बराबर है

  1. A \((420, 18)\)
  2. B \((380, 18)\)
  3. C \((420, 19)\)
  4. D \((380, 19)\)
Verified Solution

Answer & Solution

Correct Answer

(A) \((420, 18)\)

Step-by-step Solution

Detailed explanation

\((1+x)^{20}=^{20} C_{0}+^{20} C_{1}+^{20} C_{2} x^{2}+\ldots \ldots+^{20} C_{20} x^{20}.........(i)\) Differential equation w.r.t. \(x\) \(20(1+x)^{19}=\) \(^{20} C_{1} \cdot 1+2.^{20} C_{2} x+\ldots \ldots+20^{20} C_{20} x^{19}.........(ii)\) Multiply equation \((2)\) by \(x\)…
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