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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
b = (U20 - U3) / (20 - 3)
b = (20 - 71) / 17
b = -51/17
b = -3
U60 = U20 + 40 b
U60 = 20 + 40 . (-3)
U60 = 20 - 120
U60 = -100