Which set of three side lengths will not form a triangle? a 17, 12, 6 b 25, 38, 13 c 36, 14, 27 d 39, 44, 6

The two shortest sides have to add up to be bigger than the longest side.

A. 17,12,6   6+12= 18  18>17 <- this is a triangle

B. 25,13,38 25+13= 38 38=38 <- this is NOT a triangle

C. 14,27,36  14+27= 41  41>36 <- this is a triangle

D. 39,44,6= 39+6= 45 45>44 <- this is a triangle

The answer is B. 

I hope this helps!
~kaikers