Jawaban cek lampiran ya
Sn= ½ n ( a+ Un)
= ½ n (1² + (2n-1)²
= 2n³ -2n² + n
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Jawaban cek lampiran ya
Sn= ½ n ( a+ Un)
= ½ n (1² + (2n-1)²
= 2n³ -2n² + n