There are 6 students who need to stand in a row, and A and B must stand together (adjacent to each other). How many ways are there to stand?
有6个同学要站成一排，其中甲、乙二人必须站在一起(相邻)，共有几种站法？
<gadget id="calculator">5 * 4 * 3 * 2 * 1 * 2</gadget>
<output>240</output>

<result>240</result>