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svet-max [94.6K]

3 years ago

10

%7B6%7D%20%28n%20%2B%20-%201%20%2B%201%29%282%28n%20-%201%29%20%2B%20%201%29" id="TexFormula1" title=" \frac{n}{6} (n + 1)(2n + 1) - \frac{n - 1}{6} (n + - 1 + 1)(2(n - 1) + 1)" alt=" \frac{n}{6} (n + 1)(2n + 1) - \frac{n - 1}{6} (n + - 1 + 1)(2(n - 1) + 1)" align="absmiddle" class="latex-formula">

1 answer:

aleksley [76]3 years ago

7 0

Answer:

N2

Step-by-step explanation:

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