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Verified answer
Jawabu16 = 78
u3 = 13
u16 - u3 = 78-13
(16-3) b = 65
13b = 65
b = 5
u3 = a + 2b = 13
a + 10 = 13
a = 3
u8 = a + 7b = 3 + 7(5)
u8 = 38
sn = n/2 ( a + un)
s8 = 8/2 ( 3 + u8)
s8 = 4 ( 3 + 38) = 164