During the Mid-Autumn Festival, a total of 12 members of Xiaoming's family from three generations sat around the big round table to have a reunion dinner. The younger brother must sit with his elder brother Xiaoming. Please think about it and draw a picture, how many ways they sit together.
中秋佳节，小明一家三代共12口人围坐在大圆桌上吃团圆饭，弟弟一定要与小明哥哥坐在一起．请你想一想，画一画，他俩一共有多少种坐法．
<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>