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a + u2 + u3 = 36
a + 12 + u3 = 36
a + u3 = 24
u3 = 24-a
a(u2)(u3) = 1.536
a(12) (u3) = 1.536
a (u3) =128
a( 24-a) = 128
24a - a² =128
a² - 24a +128 = 0
(a - 8) ( a + 16) = 0
a= 8 atau a = 16
barisannya = 8, 12, 16 atau 16,12,8
terbesar = 16