A company wants to select two out of 5 people to study abroad. How many different ways are there?
某公司要从5个人中选两个外出学习，共有多少种不同的选法．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<result>10</result>