Question: I could find problem a. but I am struggling with b, c, and d. Find the closed formula for each of the following sequences (an)n21

I could find problem a. but I am struggling with b, c, and d.

Find the closed formula for each of the following sequences (an)n21 by relating them to a well known sequence. Assume the first term given is a1. a. 3, 6, 11, 18, 27, ... an = 12 + 2 b. -1, 1, 4, 8, 13, ... an c. 5, 10, 17, 26, 37, . .. an d. 2, 2, 3, 7, 25, ... an =

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