Which of the following sets of sides does not form a right triangle? 6, 8, 10 8, 15, 17 7, 24, 26 5, 12, 13

6^2 = 36
8^2 = 64
36+64=100 = 10^2

8^2=64
15^2=225
64+225=289
17^2 = 289

7^2=49
24^2=576
576+49=625
26^2 = 676

5^2=25
12^2=144
25+144=169
13^2=169

The third set does not make a right angled triangle.