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Verified answer
Jawabu2= 4/3
u5 = 36
u5/u2 = 36/ (4/3)
r⁵⁻² = 27
r³ = 27
r = 3
u2 = 4/3
a r = 4/3
3a = 4/3
a = 4/9
barisan itu a, ar, ar², ar³,...
4/9, 12/9, 36/9 , 108/9 ,...
atau 4/9, 4/3, 4 , 12, ...