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U₁ = a
mk U₇ = 4a
a + 6b = 4a
6b = 3a
2b = a
U₅ = 6 + U₃
a + 4b = 6 + a + 2b
2b = 6
b = 3
mk barisannya 6, 9, 12, 15, 18, 21, 24, ......