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u5 = = 48
u5 : u3 = : = 48 : 12
= 4
r = 2 atau -2
a) karena r yang diminta < 1,pakai r = -2.
u3 = = a x = 12
a = 3
b) u10 = = 3 x = 3 x (-512) = -1536
c) 5 bil pertama : 3,-6,12,-24,48