SOLUTION: Find the formula for a_n if a_1 = -4 and a_5 = 16

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Question 1087013: Find the formula for a_n if a_1 = -4 and a_5 = 16
Answer by ikleyn(52754) About Me  (Show Source):
You can put this solution on YOUR website!
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It depends on which progression it is: AP or GP.