Zhang Hua, Li Ming and other 7 students took pictures and lined up in two rows, with 3 people in the front row, Zhang Hua, and 4 people in the back row, Li Ming, among them. How many different ways are there in total?
张华、李明等7个同学照相，排成两排，前排3人张华需在其中，后排4人李明需在其中，共有多少种不同的排法？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

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

<gadget id="calculator">4 * 3 * 2 * 1</gadget>
<output>24</output>

<gadget id="calculator">10 * 6 * 24</gadget>
<output>1_440</output>

<result>1_440</result>