If seven students send messages to each other, how many messages will they send?

If seven students send messages to each other, there will be 49 messages. According to relevant information, each person sent 7 messages, totaling 7 people, and 7 times 7 equals 49. There are two kinds of SMS: one is the text or digital information sent or received directly by users through mobile phones or other telecommunication terminals, and the number of characters that users can receive and send SMS at a time is 160 English or digital characters or 70 Chinese characters. One is MMS. Its biggest feature is that it supports multimedia functions and can transmit comprehensive content and information, including text, images, sounds, data and other multimedia formats.