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evaluate the logarithmic expression

log243 n=4/5

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Is the problem log2(43n)=4/5?  or log(243n) = 4/5?  Please clarify the problem statement.
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It looks like it could also be log base 243 to the 4/5 power equals n. in that case 243=3^5 so 243^(1/5)=3^4=81.