Barisan Aritmetika
94, 90, 86, 82, ...
a = suku pertama = 94
b = beda = U2 - U1 = 90 - 94 = -4
Jumlah n suku pertama = Sn
Sn = n/2 (2a + (n - 1)b)
S8
= 8/2 (2 × 94 + (8 - 1)(-4))
= 4 (188 - 28)
= 640
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Barisan Aritmetika
94, 90, 86, 82, ...
a = suku pertama = 94
b = beda = U2 - U1 = 90 - 94 = -4
Jumlah n suku pertama = Sn
Sn = n/2 (2a + (n - 1)b)
S8
= 8/2 (2 × 94 + (8 - 1)(-4))
= 4 (188 - 28)
= 640