There are 25 large and small stations on a railway line, so how many different tickets should be prepared for this line?
某铁路线上有25个大小车站，那么应该为这条路线准备多少种不同的车票？
<gadget id="calculator">25 - 1</gadget>
<output>24</output>

<gadget id="calculator">24 * 25</gadget>
<output>600</output>

<result>600</result>