Question

can u plz tell me that answer 20th question

Answer 1

=log (x base a). log(y base b)
={log(x base e)/log (a base e)}{log (y base e)/log (b base e)}
={log (x base e)/log (b base b)}{log (y base e)/log (a base e)}
=log(x base b).log (y base a)