Which of these groups of numbers could not be the side lengths of a triangle? a. 11,13,15 b. 5,7,8 c. 2,4,4 d. 1,3,5

Triangles have to satisfy the triangle inequality, which says the sum of any two sides is strictly greater than the third.

That fails for triangle D, because 1 + 3 < 5

D

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.