May I ask how many straight lines can be drawn by connecting two pairs of lines and extending to both sides through 612 non-collinear points?
请问经过612个不共线的点，两两连线并向两边延长，共可以画出多少条直线．
<gadget id="calculator">612 - 1</gadget>
<output>611</output>

<gadget id="calculator">612 * 611</gadget>
<output>373_932</output>

<gadget id="calculator">373_932 / 2</gadget>
<output>186_966</output>

<result>186_966</result>