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1 3 9 27 ⋯ 3n 3n 1 − 1 2 for all n ≥ 0
3 + 3 2 + 3 3 + ⋯ + 3 n 3 2 3 n − 1
1 n+ 1 1 n+ 2 ⋯ ⋯ 1 n n
s 1 3 +2 3 +3 3 +⋯+n 3
what is n 3 27 9
1 +2 +3 +⋯+n
sn 1-12+13-14+⋯
1+ 1+2 + 1+2+3 +⋯+ 1+2+3+⋯+n
one 2 3 4 5 6 7
1×2+2×3+3×4+⋯+n n+1 n n+1 n+2 3
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