![\[ \sum_{n=1}^{4} {2n+2} = 1 \]](/tpl/images/1012/9384/27079.png)
![\[ \sum_{n=1}^{4} {2n+2} = 1 \] = 4+6+8+10 = 28](/tpl/images/1012/9384/3057b.png)
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