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Simplify ∑=2 =n+1 ( + 4)

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[tex] = \sum \limits_{n = 2}^{4} (n + 1)[/tex]

[tex] = (2 + 1) + (3 + 1) + (4 + 1)[/tex]

[tex] = 3 + 4 + 5[/tex]

[tex] = 12[/tex]