Choose 3 randomly from 4 different types of plasma TVs and 5 different types of LCD TVs. Among them, there must be at least 1 plasma TV and 1 LCD TV. How many different methods are there in total?
从4台不同型号的等离子电视和5台不同型号的液晶电视中任意取出3台，其中等离子电视与液晶电视至少要各有1台，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>