Elitmus Exam Numerical Ability Data Sufficiency

Q)f(x)=log(base a)x + log(base b)x where 1

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I think some condition r missing
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log(base)(one) is always zero
hence is zero
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If ther x=1 then f(X) is always 0 if a and b not equal to zero
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Elitmus Other Question

f(x)=logaX+logbXwhere1 Q)f(x)=log(base a)x + log(base b)x;where a is greater than 1 and less than b and value of log(base a)x>1,then what is the minimum value of f(x)
optn:-0,1,2,1+log(not remember proper option)