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

\(\sum_{\mathrm{k}=0}^{20}\left({ }^{20} \mathrm{C}_{\mathrm{k}}\right)^{2}\) ની કિમંત મેળવો.

  1. A \({ }^{40} \mathrm{C}_{21}\)
  2. B \({ }^{40} \mathrm{C}_{19}\)
  3. C \({ }^{40} \mathrm{C}_{20}\)
  4. D \({ }^{41} \mathrm{C}_{20}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \({ }^{40} \mathrm{C}_{20}\)

Step-by-step Solution

Detailed explanation

\(\sum_{\mathrm{k}=0}^{20}{ }^{20} \mathrm{C}_{\mathrm{k}} \cdot{ }^{20} \mathrm{C}_{20-\mathrm{k}}\) sum of suffix is const. so summation will be \({ }^{40} \mathrm{C}_{20}\)
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