There are 7 points on the plane, and every 3 points are not on the same straight line. If 18 line segments are connected between these 7 points, how many triangles can these line segments form at most?
在平面上有7个点，其中每3个点都不在同一条直线上．如果在这7个点之间连接18条线段，那么这些线段最多能构成多少个三角形．
<gadget id="calculator">35 - 5 - 4 - 3</gadget>
<output>23</output>

<result>23</result>