If x, y, and z are positive integers such that x^2 + y^2 + z^2 = , which of the following could be the values of x, y, and z?
I)x=10 y=20 z=30
II)x=5 y=30 z=13
III)x=20 y=-30 z=10	Choose the correct option:
A) I only	B) II only	C) III only	D) I​ and II	E) I and III
The x,y and z are easiest number,so it is easy to find the squares of the values.   Here III) option gives y=-30..(30^2) and(-30^2) are equal.   Answer is option I and III
<result>E</result>
If x, y, and z are positive integers such that x^2 + y^2 + z^2 = , which of the following could be the values of x, y, and z?
I)x=10 y=20 z=30
II)x=5 y=30 z=13
III)x=20 y=-30 z=10