Penjelasan dengan langkah-langkah:
U5 = a + 4b = 38
U10 = a + 9b = 88
9b - 4b = 88 - 38
5b = 50
b = 10
a + 4 (10) = 38
a + 40 = 38
a = -2
jumlah 20 suku pertama
Sn = n/2 (2a + (n - 1) . b)
S20 = 20/2 (2 . -2 + (20 - 1) . 10)
S20 = 10 (-4 + 190)
S20 = 1.860
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Penjelasan dengan langkah-langkah:
U5 = a + 4b = 38
U10 = a + 9b = 88
9b - 4b = 88 - 38
5b = 50
b = 10
a + 4 (10) = 38
a + 40 = 38
a = -2
jumlah 20 suku pertama
Sn = n/2 (2a + (n - 1) . b)
S20 = 20/2 (2 . -2 + (20 - 1) . 10)
S20 = 10 (-4 + 190)
S20 = 1.860