The school organizes 482 people to go on an outing, and rents 42-seat buses and 20-seat minibuses. If each person is required to have one seat and each seat is one person, and the rented vehicles do not leave empty seats, how many car rental plans are there?
学校组织482人去郊游，租用42座大巴和20座中巴两种汽车，如果要求每人一座且每座一人，租用的车辆不留空座，则有多少种租车方案．
<result>2</result>