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

यदि \(\left({ }^{30} \mathrm{C}_1\right)^2+2\left({ }^{30} \mathrm{C}_2\right)^2+3\left({ }^{30} \mathrm{C}_3\right)^2+\ldots \ldots .\). \(30\left({ }^{30} \mathrm{C}_{30}\right)^2=\frac{\alpha 60 !}{(30 !)^2}\), है, तो \(\alpha \cdot\) बराबर है :

  1. A \(30\)
  2. B \(60\)
  3. C \(15\)
  4. D \(10\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(15\)

Step-by-step Solution

Detailed explanation

\(S =0 .\left({ }^{30} C _0\right)^2+1 \cdot\left(\cdot{ }^{30} C _1\right)^2+2 \cdot\left({ }^{30} C _2\right)^2+\ldots \ldots+30 \cdot\left({ }^{30} C _{30}\right)^2\) \( S =30 \cdot(^{30} C _0)^2+29 \cdot{ }^{30} C _1)^2+28 \cdot{ }^{30} C _2)^2\)…
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