I thought except ‘3’ all positive values works. Why not 1, 2, 12, 20…?

The sum of two sides of a triangle have to be bigger than the other side. Therefore, in our example, you cannot have 1,2, or 3 since 4+1/2/3<7. Equally, you cannot take anything greater or equal than 11 since that number would be bigger or equal to 4+7

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But having 3rd side as 1/2 also forms a triangle right?

1/2 as 0.5 or as 1 or 2? But either way it wouldn’f be a triangle because 4+ either of those is less than 7 but it has to be more.

Thanks got it.