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u2 = 36 / 3 =12
a + 12 + u3 = 36
a + u3 = 24......u3 = 24 -a
a *12*u3 = 1536
a*u3 =128
a(24-a) = 128
24a - a² = 128
a² - 24a + 128 = 0
(a - 8 ) ( a - 16)
a = 8 atau a = 16
barisan itu 8, 12, 16 atau 16,12,18
a. b = 12- 8 = 4
b. 8, 12, 16
c. 16
d. 8*16 =128