In a certain conference each row of chairs has the same number of chairs, and the numberof row is 1 less than the number of chairs in a row. How many chairs are in a row? (1)There is a total of 72 chairs. (2)After 1 chair is removed from the last row, there is a total of 17 chairs in the last 2 rows. 这题我当时做模考看了10分钟愣是没看明白，没办法只好抄下来。后来自己再看，单词都这么简单但是还是不明白它表达的是一个什么意思，我就是绕不过来这个弯，哪位XDJM帮忙解释一下，谢谢了！ | 
