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(n)/(6) (n + 1)(2n + 1) - (n - 1)/(6) (n + - 1 + 1)(2(n - 1) + 1) ​
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(n)/(6) (n + 1)(2n + 1) - (n - 1)/(6) (n + - 1 + 1)(2(n - 1) + 1)
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User Bob Brunius
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1 Answer

3 votes

Answer:

N2

Explanation:

User Saneef
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