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

मान \([ x ]\) महत्तम पूर्णांक \(\leq x\) है। यदि \(n \in N\) के लिए \(,\left(1-x+x^{3}\right)^{n}=\sum_{j=0}^{3 n} a_{j} x^{j}\) है, तो  \(\sum_{j=0}^{\left[\frac{3 n}{2}\right]} a_{2 j}+4 \sum_{j=0}^{\left[\frac{3 n-1}{2}\right]} a_{2 j+1}\)  बराबर है 

  1. A \(2\)
  2. B \(2^{ n -1}\)
  3. C \(1\)
  4. D \(n\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(1\)

Step-by-step Solution

Detailed explanation

\(\left(1-x+x^{3}\right)^{n}=\sum_{j=0}^{3 n} a_{j} x^{j}\) \(\left(1-x+x^{3}\right)^{n}=a_{0}+a_{1} x+a_{2} x^{2} \ldots \ldots .+a_{3 n} x^{3 n}\) \(\sum_{j=0}^{\left[\frac{3 n}{2}\right]} a_{2 j}=\operatorname{Sum}\) of \(a_{0}+a_{2}+a_{4} \ldots \ldots . .\)…
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