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It is called an Artithematico-geometric series.
You write a few terms and generalize for n using basic calculation. However, if you expand it a few times, you'll start seeing patterns easily and no calculation will be required.
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It is called an Artithematico-geometric series. You write a few terms and generalize for n using basic calculation. However, if you expand it a few times, you'll start seeing patterns easily and no calculation will be required.