Please solve question no.29.

1>We have to evaluate-

7log16/15 + 5log25/24 + 3log81/80

So,

$= \log (\frac{2^{28}}{3^{7} 5^{7}} \frac{5^{10}}{2^{15} 3^{5}} \frac{3^{12}}{2^{12} 5^{3}}) = \log 2$

2>We have,

$= \frac{1}{\log_{a} a b c} + \frac{1}{\log_{b} a b c} + \frac{1}{\log_{c} a b c}$

=log_abc ^a+ log_abc ^b+log_abc

=log_abc ^abc