In the physical education class, the teacher picks 4 boys out of 10 to stand in a row. How many different ways are there?
体育课上，老师从10名男生中挑出4人站成一排，-共有多少种不同的排列方法？
<gadget id="calculator">10 * 9 * 8 * 7</gadget>
<output>5_040</output>

<result>5_040</result>