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Question

The value of the expression ⎜ ⎜811log59+33log63409⎟ ⎟(71log25751log635) is

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Solution

Given,
⎜ ⎜811log59+33log63409⎟ ⎟(71log25751log635)
=(81log95+33log36409)(7log7255log5632)[logab=1logba]
=25+632409(25632)[mloga=logam&alogab=b]=625216409=1

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