The domain of the function f(x)=log7(log3(log5(20x−x2−91)))f(x) =log_{7}({ log_{3}(log_{5}(20x-x^{2}-91 )))}f(x)=log7(log3(log5(20x−x2−91))) is:
(7, 13)
(8,12)
(7, 12)
(12,13)
None of the above
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