Question: Please explain how to come up with the formula for the nth term. I'm very confused on this one because the common difference is halved

Please explain how to come up with the formula for the

Please explain how to come up with the formula for the nth term. I'm very confused on this one because the common difference is halved each term, but then if you take the ratio of the first difference you get 1/2. Is there a way to combine a arithmetic sequence and a geometric sequence?Thanks!

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