Penjelasan dengan langkah-langkah:
kelipatan 3 dan 4 = 12
a = 204
Un = 444
b = 12
Un = 204 + 12n - 12 = 444
192 + 12n = 444
12n =252
n = 21
S21 = n/2 (a + Un)
s21 = 21/2 (204 + 444) = 6804
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Penjelasan dengan langkah-langkah:
kelipatan 3 dan 4 = 12
a = 204
Un = 444
b = 12
Un = 204 + 12n - 12 = 444
192 + 12n = 444
12n =252
n = 21
S21 = n/2 (a + Un)
s21 = 21/2 (204 + 444) = 6804