Write down the first four terms of each of the. sequences whose \( n \)th terms are: \[ a_{n}=\l...
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0Write down the first four terms of each of the. sequences whose \( n \)th terms are:
\[
a_{n}=\left[\frac{1+(-1)^{n}}{2}\right] \cdot 2^{n}
\]
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