[CV124] Missing Number

As mentioned earlier, the numbers are lined up according to some rule or idea.

Continuing the string out to the left, the number that would go in front of the first number is zero.

The number that comes after the final three is one.

If you were to break up the string of numbers, the first group is "1231."

Does this group make you think of anything? Anything at all?

First, go ahead and count the large triangle all by itself. Then, add one of the three lines that splits the big triangle into two. Now your total has grown to three triangles.

Next, add one more line to your big triangle and you'll create three new triangles. There are three combinations of two lines possible.

Good luck finding the rest