જો $A = {\log _2}{\log _2}{\log _4}256 + 2{\log _{\sqrt 2 \,}}\,2$ તો $A = . . . .$

$7\log \left( {{{16} \over {15}}} \right) + 5\log \left( {{{25} \over {24}}} \right) + 3\log \left( {{{81} \over {80}}} \right)= . . . .$

જો ${\log _7}2 = m$ તો ${\log _{49}}28 = . . . .$

${\log _3}\,4{\log _4}\,5{\log _5}\,6{\log _6}\,7{\log _7}\,8{\log _8}\,9= . .$ . .

જો ${a^x} = b,{b^y} = c,{c^z} = a,$ તો $xyz = . . . .$

જો ${\log _4}5 = a$ અને ${\log _5}6 = b $ તો ${\log _3}2= . . . .$