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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
b = (U4 - U2)/(4 - 2)
b = (15 - 5)/2
b = 10/2
b = 5
U12 = U4 + 8b
U12 = 15 + 8 . 5
U12 = 15 + 40
U12 = 55