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U3 = 11
U9 = 29
U15 = ?
U3 = a + 2b = 11
U9 = a + 8b = 29 _
- 6b = - 18
b = 3
a + 2b = 11
a + 2(3) =11
a = 11 - 6
a = 5
maka
U15 = a + 14 b = 5 + 14(3) = 47
maka suku ke 15 = 47
semoga membantu 6_^