Jawabanmu

2014-01-19T21:18:22+07:00
203, 210, 217, 224, 231, 238, 245, 252, 259, 266, 273, 280, 287, 294
Jawaban paling cerdas!
2014-01-19T21:27:25+07:00
203 + 210 + 217 + ... + 294 = Sn = ...?
294 = 203 + (n - 1)7
(n - 1) 7 = 91 ------> n = 14
Sn = S14 = 14/2 (2 x 203 + 13 x 7) = 3479

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