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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