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Verified answer
U1 = u2 - b= 8 - 5
= 3
jadi suku 1 adalah 3
Bab Barisan dan Deret Bilangan
U1 = U2 - b
U1 = 8 - 5
U1 = 3
U5 = U2 + 3b
U5 = 8 + 3 . 5
U5 = 8 + 15
U5 = 23
Sn = n/2 . (a + Un)
S5 = 5/2 . (3 + 23)
S5 = 2,5 . 26
S5 = 65