Upgrade to access all content for this subject

Which of these is equivalent to ${ w }^{ \frac { 2 }{ 5 } }$?

$\sqrt [ 5 ]{ w } $

$\sqrt [ 5 ]{ { w }^{ 2 } } $

$\sqrt [ 2 ]{ { w }^{ 5 } } $

$\sqrt { { w }^{ 5 } } $