There are 4 balls in one pocket and 5 balls in the other pocket. These balls are of different colors. 3 balls are randomly drawn from the two pockets, and at least 1 ball is drawn from each pocket. How many different balls are there in total? How to take it?
一个口袋中有4个球，另一个口袋中有5个球，这些球颜色各不相同，从两个口袋中任意取出3个球，并且每个口袋中至少取出1个球，共有多少种不同的取法？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">4 * (3/2)</gadget>
<output>6</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">40 + 30</gadget>
<output>70</output>

<result>70</result>