Mathematics
Senior High
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途中式教えてください🙏
(2)第n群は,初項 n(n+1), 公差 1 項数n+1の等差数列で
あるから, その和は,
1/12 (n+1) [2.1/2n(n+1)+{(n+1)−1)-1]
=1/2(n+1)(
(n+1) (n2+2n)
(12/1n(n+1)(n+2)
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