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2014-07-17T06:40:53+07:00
U1 = a = 2
U 17 = a+16 b =50 --> 2 + 16b = 50 --> 16b = 48 --> b = 3
U8 = a + 7b = 2+7(3) = 23

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2014-07-17T06:42:07+07:00
U₁₇ = a + 16b = 50
U₁   = a            = 2
                 16b = 48
                      b = 3
U₈ = a + 7b = 2 + 7(3) = 2 + 21 = 23