What is the probability that three lines of length 2,4,6,7 can form a triangle_______ . draw a tree diagram

What is the probability that three lines of length 2,4,6,7 can form a triangle_______ . draw a tree diagram

What is the probability that three lines of length 2,4,6,7 can form a triangle____ 1/2___ .
246 and 247 do not form triangles
267 and 467 can form triangles