1. U5 = 8
U13 = 16
U9 = ....?
U5= a + 4b = 8
U13= a + 12b = 16
______________-
-8b = -8
b = 1
a + 4b = 8
a + 4.1 = 8
a + 4 = 8
a = 8-4 = 4
U9 = a + 8b
= 4 + 8.1
= 12
Jadi, suku ke 9 adalah 12
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1. U5 = 8
U13 = 16
U9 = ....?
U5= a + 4b = 8
U13= a + 12b = 16
______________-
-8b = -8
b = 1
a + 4b = 8
a + 4.1 = 8
a + 4 = 8
a = 8-4 = 4
U9 = a + 8b
= 4 + 8.1
= 12
Jadi, suku ke 9 adalah 12