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U1 + U2 + U3 = 459
a + ( a + b ) + ( a + b ) = 459
3a + 3b = 459
3a + 6 = 459
3a = 453
a = 151
U1 = a = 151
U3 = a + 2b = 151 + 4 = 155
U1 + U3 = 151 + 155 = 306
x + x + 2 + x + 4 = 459
3x + 6 = 459
3x = 459 - 6
3x = 453
x = 453 / 3
x = 151
jumlah bil terkecil dan terbesar = x + x + 4
= 151+ 151 + 4
= 302 + 4
= 306