There are 19 people in a circle, and 4 people are selected from them. It is required that exactly 3 of these 4 people are adjacent to each other. How many different ways are there in total?
有19人围成一圈，从中选出4个人，要求这4个人恰好有3人相邻，一共有多少种不同的选法．
<gadget id="calculator">19 - 3 - 2</gadget>
<output>14</output>

<gadget id="calculator">19 * 14</gadget>
<output>266</output>

<result>266</result>