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 :
\( a_{n}=\left\{\begin{array}{l}n^{2}-1, \text { if } n \text { is odd } \\ \frac{n^{2}+1}{2} \text {, if } n \text { is even }\end{array}\right. \).
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