Mathematics, 09.04.2021 02:50, ballbritez

Please help! Laural had to find the sum for the arithmetic series below. What did she do wrong?

Step__is incorrect because_.Instead, you should_.

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Laural had to find the sum for the arithmetic series below. What did she do wrong?
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Please help! Laural had to find the sum for the arithmetic series below. What did she do wrong?