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Verified answer
U1 + U3 = 12a + a+2b = 12
2a + 2b = 12
2 (a+b) = 12
a+b = 6
U1 × U2 = 24
a × a+b = 24
a × 6 = 24
a = 4
a + b = 6
4+ b = 6
b = 2
Urutan aritmatika: 4, 6, 8, 10, 12, 14,...
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