Elitmus Exam Numerical Ability Log and Antilog

if z=(log(base a)(log(base b)(a)))/(log(base b)(log(base a)(b)))
simplify z

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Elitmus Other Question

if z=(log(base a)(log(base b)(a)))/(log(base b)(log(base a)(b))) in elitmus exam,cryptic division problem ask or not ,and only multiplication problem asked???