If the ninth term in the expansion of [3^ _ 3 25^ x-1 +7 +3^ - 1 4 _ 3 [5^ x-1 +1 ] ] is…
Mathematics · JEE Main · NTA Exams — Binomial Theorem And Its Simple Applications
If the ninth term in the expansion of \(\left[3^{\log _{3} \sqrt{25^{x-1}+7}}+3^{-\frac{1}{4} \log _{3}\left[5^{x-1}+1\right]}\right]\) is equal to 180 and \(x>1\), then \(\mathbf{x}\) equals
- \(\log _{10} 15\)
- \(\log _{5} 15\)
- \(\log _{r} 15\)
- None of these
Answer
(D) None of these
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