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Un = a + (n-1)b
U6 = a + (6-1)b = 12 => a + 5b = 12
U3 = a + (3-1)b = 96 => a + 2b = 96 _
3b = -84
b = -84 /3 = -28
substitusikan persamaan ke 2
a + 2b = 96
a + 2(-28) = 96
a -56 = 96
a = 96+56
a = 152
U10 = a + (10-1)b
U10 = 152 + 9(-28)
= 152 - 252
U10. = -100
sekian
maaf jika salah