2 answers:
The first one, 18cm, 6cm, 13cm. First, we need to learn about the triangle equality, it is A + B > C.
So if we take 6+18 it would be 24 which is greater than 13.
Also we have to try 6+13 it would be 19, which is greater than 18.
Then we also have to try 18+13, which is 31. And it is greater than 6.
When it does not fail the triangle equality, it can be a triangle.
I think it is the three one
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