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If (log)3x=a and (log)7x=b , then which ...

If `(log)_3x=a` and `(log)_7x=b ,` then which of the following is equal to `(log)_(21)x ?` `a b` (b) `(a b)/(a^(-1)+b^(-1))` `1/(a+b)` (d) `1/(a^(-1)+b^(-1))`

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RESONANCE DPP ENGLISH-JEE MAINS-All Questions
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  3. If (log)3x=a and (log)7x=b , then which of the following is equal to (...

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