Draw 50 straight lines arbitrarily on the same plane, how many points of intersection can these lines form at most?
在同一个平面中任意画50条直线，这些直线最多能形成多少个交点？
<gadget id="calculator">50 - 1</gadget>
<output>49</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">49 * 25</gadget>
<output>1_225</output>

<result>1_225</result>