Two marks exercise problems VI — task. Mathematics State Board, Class 10.

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Find the first four terms of the sequences whose \(n^{\text{th}}\) terms are given by

\(a_n = (-1)^{n + 1} n (n + 1)\)

\(-2\), \(-10\), \(28\) and \(-42\)
\(-2\), \(8\), \(-12\) and \(20\)
\(2\), \(-8\), \(16\) and \(-32\)
\(2\), \(-6\), \(12\) and \(-20\)

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