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dan bedanya 3
suku awal (a)
U3 = a + 2b
8 = a + 2b
8 = a + (2 x 3)
8 = a + 6
a = 8-6
a = 2
S5 = ?
Sn = n/2 (2a + (n-1)b)
S5 = 5/2 (2x2 + (5-1)3)
S5 = 2,5 (4 + (4 x 3)
S5 = 2,5 (4 + 12)
S5 = 2,5(16)
S5 = 40