Joke Collection Website - Public benefit messages - Xiao Ming sent a text message with New Year greetings to some friends. The number of people who received the message was also increased by the number of people Xiao Ming sent.
Xiao Ming sent a text message with New Year greetings to some friends. The number of people who received the message was also increased by the number of people Xiao Ming sent.
Assume that each person sends a text message to x person in each round,
According to the question, we get: =5, x 2 =-7 (does not meet the meaning of the question, discard it)?
So the answer is: 5.
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