Question

Which set of lengths could not form a triangle?

{5, 7, 10}

{2, 4, 5}

{8, 12, 5}

{15, 7, 6}

Answer 1

The fourth one, because 7+6=13, but it should be bigger than 15

Answer 2

The set of lengths that could not form a triangle is 15,7,6