question_answer

Which of the following is the greatest of the three numbers? \[x={{(5)}^{1/3}},\] \[y={{(19)}^{1/4}},\]\[z={{(21)}^{1/6}}\]

A)  \[x\]                

B)  \[y\]

C)  \[z\]                             

D)  \[x=y\]

E)  None of these