How many different line segments can be obtained by taking 8 points on a line segment?
在一条线段上取8个分点，共得到多少条不同的线段．
<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">10 * (9/2)</gadget>
<output>45</output>

<result>45</result>