Jawabanmu

2014-02-26T19:41:24+07:00
S20 = 20^2 + 3.20 = 400 + 60 = 460 gitu?
Jawaban paling cerdas!
2014-02-26T20:01:14+07:00
Sn=n2+3n
S20= 20.20+ 3.20
      = 400+60=460
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