英语翻译A certain communication system is made up of 40 symbols.A maximum of two symbols placed together,order not mattering,make up a word.What is the maximum number of words in this communication system?
问题描述：
英语翻译
A certain communication system is made up of 40 symbols.A maximum of two symbols placed together,order not mattering,make up a word.What is the maximum number of words in this communication system?
答
某种通讯程序（系统）是由40个代号构成的.最多两个符号（不考虑顺序）可以放在一起构成信息词汇,那在这个通讯程序中最多可以有多少信息词汇?