Q.

The domain of the function f(x)=log4{log5(log3(18xx277))} is (α,β) then αβ=______

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answer is 80.

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Detailed Solution

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f(x)=log4{log5(log3(18xx277))} is defined

When log5{log3(18xx277)}>0 and 18xx277>0

log3(18xx277)>5° and x218x+77<0

18xx277>3 and (x7)(x11)<0

x218x+80<0 and 7<x<11

8<x<10 and 7<x<118<x<10x(8,10)

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