Respuesta :

SOLUTION:

We use the rule;

[tex]\frac{log_ap}{log_aq}=log_qp[/tex]

Looking at the question;

[tex]log_621=\frac{log_{10}21}{log_{10}6}[/tex]

Thus, the answer is

[tex]\frac{log_{10}21}{log_{10}6}[/tex]

Option C

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