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

\((2+\mathrm{x})^9\) के द्विपद प्रसार में \(\mathrm{x}, \mathrm{x}^2, \ldots \ldots \mathrm{x}^7\) के गुणांकों का माध्य _______________है।

  1. A \(2735\)
  2. B \(2736\)
  3. C \(2734\)
  4. D \(2785\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(2736\)

Step-by-step Solution

Detailed explanation

Coefficient of \(x ={ }^9 C _1 2^8\) Of \(x ^2={ }^9 C _2 2^7\) Of \(x ^7={ }^9 C _7 \cdot 2^2\) Mean \(=\frac{{ }^9 C _1 \cdot 2^8+{ }^9 C _2 \cdot 2^7 \ldots . .+{ }^9 C _7 \cdot 2^2}{7}\) \(=\frac{(1+2)^9-{ }^9 C _0 \cdot 2^9-{ }^9 C _8 \cdot 2^1-{ }^9 C _9}{7}\)…
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