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u5 = ar⁴
u5 : u3 = r² = 405 : 45 = 9
maka r = 3
ar² = 45
a = 5
u9 = ar⁸
= 5 x (3)⁸ = 5 x 6561 = 32.805
C,
u5=405
dit u9=un=a+(n-1)b
b= u5-u3
5-3
=405-45
2
=360
2
=180