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Sn = n / 2 (2a + (n - 1) b)...........karena Un = a + (n - 1) b, maka dpt juga ditulis
Sn = n / 2 ( a + Un)
Rumus deret ukur / geometri :
Sn = a (1 - r^n ) / 1 - r .........jika r < 1
Sn = a (r^n - 1) / r - 1 ..........jika r > 1
semoga bermanfaat ya,,