Tentukan banyak suku dan jumlah barisan aritmatika dari:
-12-8-4-0+......+128
-12-8-4-0+......+128
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b = -8 -(-12) = 4
Un = a +(n-1)b
128 = -12 + 4n - 4
128 = 4n - 16
4n = 144
n = 36
S36 = 36/2 (2(-12) + 35(4))
= 18 ( -24 + 140)
= 18 (116)
= 2088