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3. Find the general term for the following sequences

Answer variants:

a_{n} = n + 1

a_{n} = {(- 1)}^{n - 1} 4^{2}

a_{n} = {(- 1)}^{n + 1} 4^{n}

a_{n} = \frac{n}{4}

4, −16, 64, −256, , , , …

The general term is

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