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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
b = (U5 - U3)/(5 - 3)
b = (31 - 17)/2
b = 14/2
b = 7
U20 = U5 + 15b
U20 = 31 + 15 . 7
U20 = 31 + 105
U20 = 136