Imagine an email system that delivers emails to people who join a group. It sends emails in the following way: it sends no mail to the first person, one mail to the second person, 2 mails to the third person, and so on. What is the recurrence relation which represents the total number of emails sent when the nth person joins the group? [Hint Linear Recurrence Relation]
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I am really really so sorry I don't know the answer
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