The greatest number among $\root 3 \of 9 ,\root 4 \of {11} ,\root 6 \of {17} $ is
$\root 3 \of 9 $
$\root 4 \of {11} $
$\root 6 \of {17} $
Can not be determined
If $a = \sqrt {(21)} - \sqrt {(20)} $ and $b = \sqrt {(18)} - \sqrt {(17),} $ then
$\sqrt {(3 + \sqrt 5 )} $ is equal to
If ${a^x} = {b^y} = {(ab)^{xy}},$ then $x + y = $
Let ${7 \over {{2^{1/2}} + {2^{1/4}} + 1}}$$ = A + B{.2^{1/4}} + C{.2^{1/2}} + D{.2^{3/4}}$, then $A+B+C+D= . . .$
If $x = {2^{1/3}} - {2^{ - 1/3}},$ then $2{x^3} + 6x = $