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Question Number 105269 by malwaan last updated on 27/Jul/20

$$a;b;carerealnumbers$$$$1<b<c^2<a^{10}$$$${log}_{a}b+2{log}_{b}c+5{log}_{c}a=12$$$$provethat$$$$2{log}_{a}c+5{log}_{c}b+10{log}_{b}a⩾21$$

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