It is known that there are k different combinations of forming a 3-person working group from 5 students. Find the value of k.
已知从5名学生中组成一个3人工作小组共有k种不同的组合．求k的值．
<gadget id="calculator">5 * 4 * 3</gadget>
<output>60</output>

<gadget id="calculator">3 * 2 * 1</gadget>
<output>6</output>

<gadget id="calculator">60 / 6</gadget>
<output>10</output>

<result>10</result>