If 10 and 15 are the lengths of two sides of a triangular region, which of the following can be the length of the third side?
I. 10
II. 15
III. 25	Pick:	A) I only	B) II only	C) I and II only	D) II and III only	E) I, II, and III
The length of any side of a triangle must be larger than the positive difference of the other two sides, but smaller than the sum of the other two sides.   Let x be the length of the third side.   15-10 &lt; x &lt; 15+10   5 &lt; x &lt; 25   The answer is I and II only.
<result>C</result>
If 10 and 15 are the lengths of two sides of a triangular region, which of the following can be the length of the third side?
I. 10
II. 15
III. 25