Answer:
2
Explanation:
13, 15, 27 and 13, 27, 15
you could rearrange the order but they would still be the same two triangles in different rotated positions:
15, 13, 27 is the same as 13, 27, 15, just rotated
15, 27, 13 is the same as 13, 15, 27, just rotated
27, 13, 15 is the same as 13, 15, 27, just rotated
27, 15, 13 is the same as 13, 27, 15, just rotated