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Find the sum Sn of each arithmetic sequence.

1. 2,5,8, ... to 12 terms
2. 3,6,9, ... to 32 terms
3. 1.4, 4.5, 7.6, ... to 21 terms
4. x-2, 4x, 7x+2, ... to 12 terms ​​

Sagot :

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