Mathematics
Senior High
Solved
式があっているのですが計算があいません💦
誰かここの途中式を教えてください🙏
n-
an= a₁ + Σ(3k² + k)
k=1
= 2+3 · (n −1)n(2n-1) + (n −1)n
an=n³-n²+2
1
よって
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