An user of Facebook which is two or more days older can send a friend request to some one to join Facebook if initially there is one user on day one then find a recurrence relation for an where an is number of users after n days
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Please find below the solution to the asked query
Hope this would clear your doubt about the topic.
If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.
Regards