If n is not a multiple of 3, then the coefficient of x n in the expansion of _ r [1+x+x^…
Mathematics · JEE Main · NTA Exams — Binomial Theorem And Its Simple Applications
If n is not a multiple of 3, then the coefficient of xn in the expansion of \(\log _{r}\left[1+x+x^{2}\right]\) is :
- \(-\frac{2}{n}\)
- \(-\frac{1}{n}\)
- \(\frac{2}{n}\)
- \(\frac{1}{n}\)
Answer
(D) 1 n
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