There are 20 seats in a row of a movie theater. Xiao Ming and Xiao Dong are good friends. If they want to sit together, how many different ways can they sit in the same row?
电影院的一排有20个座位，小明、小东是好朋友，要让他俩坐在一起，在同一排有多少种不同的坐法？
<gadget id="calculator">20 - 1</gadget>
<output>19</output>

<gadget id="calculator">19 * 2</gadget>
<output>38</output>

<result>38</result>