A) 6
B) 36
C) 125
D) None of these
Correct Answer: C
Solution :
(c): \[lo{{g}_{5}}x+21o{{g}_{25}}x+31o{{g}_{125}}x=9\] \[\Rightarrow lo{{g}_{5}}\text{ }x+lo{{g}_{5}}x+lo{{g}_{5}}x=9\] \[\Rightarrow \]\[3lo{{g}_{5}}x=9\Rightarrow lo{{g}_{5}}x=3\] \[\Rightarrow x=5\]
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