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  4. Let λ= log 5 log 5(3). If 3k+5-λ=405. then the value of k is

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Q. Let $\lambda=\log _5 \log _5(3)$. If $3^{k+5^{-\lambda}}=405$. then the value of $k$ is

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Solution:

Correct answer is (c) 4