Question

Which board lengths could be joined to form a triangle?

a) 10, 10, 20

b) 13, 10, 3

c) 29, 25, 3

d) 30, 40, 50

Answer 1

To form a triangle, the sum of 2 sides must be greater than the other one, that is
a+b>c
and a+c>b
and b+c>a
So you can try the 4 options and see which satisfy the condition

Answer 2

Callisto is right, but those should be ORs instead of ANDs

Answer 3

the answer is letter d

Answer 4

Nope, the 3 conditions must be satisfied not an 'or' case

Answer 5

right again, I was mistakes... must still be asleep
need more coffee