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17-12 : 5
5-18 : -13
-18-24 : -42
-42-30 : -72
-72-36 : -108
-108-42 : -150
-150-48 : -198
-198-54 : -252
-252-60 : -312
-312-66 : -378
Jawabanya yaitu -378
Maka,
a = 23
b = -6
c = -6
Diberikan: