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

यदि \(\frac{{ }^{11} \mathrm{C}_1}{2}+\frac{{ }^{11} \mathrm{C}_2}{3}+\ldots . .+\frac{{ }^{11} \mathrm{C}_9}{10}=\frac{\mathrm{n}}{\mathrm{m}}\) है, तथा \(\operatorname{gcd}(\mathrm{n}, \mathrm{m})=1\) है, तो \(\mathrm{n}+\mathrm{m}\) = ...........

  1. A \(2041\)
  2. B \(2024\)
  3. C \(2014\)
  4. D \(2043\)
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Answer & Solution

Correct Answer

(A) \(2041\)

Step-by-step Solution

Detailed explanation

\( \sum_{\mathrm{r}=1}^9 \frac{{ }^{11} \mathrm{C}_{\mathrm{r}}}{\mathrm{r}+1} \) \( =\frac{1}{12} \sum_{\mathrm{r}=1}^9{ }^{12} \mathrm{C}_{\mathrm{r}+1}\) \( =\frac{1}{12}\left[2^{12}-26\right]=\frac{2035}{6} \) \(\therefore \mathrm{m}+\mathrm{n}=2041\)
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