You have 5 sticks of lengths 10, 20, 30, 40, 50 centimeters. The number of non-congruent triangles that can be formed by choosing three of the sticks to make the sides is	Choose the correct answer:
A) 3
B) 6
C) 7
D) 10
E) 12
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.   Based on this there can be only 3 triangles formed: (20, 30, 40), (20, 40, 50), (30, 40, 50)   3nswer; 3.
<result>A</result>
You have 5 sticks of lengths 10, 20, 30, 40, 50 centimeters. The number of non-congruent triangles that can be formed by choosing three of the sticks to make the sides is