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

गुणन \(\left(2-x^{2}\right) \cdot\left(\left(1+2 x+3 x^{2}\right)^{6}+\left(1-4 x^{2}\right)^{6}\right)\) के प्रसार में \(x^{2}\) का गुणांक है

  1. A \(106\)
  2. B \(107\)
  3. C \(155\)
  4. D \(108\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(106\)

Step-by-step Solution

Detailed explanation

\(\text { Let } a=\left(\left(1+2 x+3 x^{2}\right)^{6}+\left(1-4 x^{2}\right)^{6}\right)\) \(\therefore \) Coefficient of \(x^{2}\) in the expansion of the product \(\left(2-x^{2}\right)\left(\left(1+2 x+3 x^{2}\right)^{6}+\left(1-4 x^{2}\right)^{6}\right)\)…
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