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1+11 +12 +⋯+1n +⋯
1 + a + a 2 + a 3 + ⋯ + a n a n+1−1 a−1
1+11 +12 +⋯+1n
1 3 9 27 ⋯ 3n 3n 1 − 1 2 for all n ≥ 0
1 +2 +3 +⋯+n
c n 0 +c n 1 +⋯+c n n
sn 1-12+13-14+⋯
1+ 1+2 + 1+2+3 +⋯+ 1+2+3+⋯+n
1 n+1 +1 n+2 +⋯⋯+1 n+n
1×2+2×3+3×4+⋯+n n+1 n n+1 n+2 3
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