1+3+5+...+17. =n² n=
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1+3+5+...+17. =n² n=
1 Jawaban
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1. Jawaban alfainer11
un = 2n -1
17 = 2n -1
18 = 2n
9 = n
s17 = 1/2 × 17 (2×1 +(17-1)×2)
s17 = 1/2 × 17 × 34
s17 = 289
s17=n²
289 = n²
√289 = n
n= 17