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U12 = a + 11b = -7
---------------- -
-5b = 10
b = 10/-5
b = -2
a + 6b = 3
a + 6.(-2) = 3
a - 12 = 3
a = 3 + 12
a = 15
Maka,
U4 = a + (n-1)b
= 15 + (4-1).-2
= 15 + 3.(-2)
= 15 - 6
U4 = 9
Maka, Nilai U4 adalah 9
U12 = a + 11b = -7 -
---------------------------------
-5b = 10
b = 10/-5 = -2
a+6b = 3
a+6.-2 = 3
a = 3+12 = 15
U4 = 15 + 3.-2 = 15 - 6 = 9