问一道英语数学题的翻译!A network with n points and a segment joining each point to every other point is called a complete network of size n. If k is the number of segments in a complete netwiork of size n, which of the following is the number of segments in a complete network of size n+1?
问题描述：
问一道英语数学题的翻译!
A network with n points and a segment joining each point to every other point is called a complete network of size n. If k is the number of segments in a complete netwiork of size n, which of the following is the number of segments in a complete network of size n+1?
答
一个网络形的图形由n个点组成,所有点之间用线段两两相连,这称为大小为n的完整网络.如果k是大小为n的完整网络的线段数,那么下面的那个答案是大小为n+1的完整网络的线段数?