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u2 = 81 = 243/3^2-1 = 243/3 = 81
u3 = 27 = 243/3^3-1 = 243/3^2 = 243/9 = 81
u4 = 9 = 243/3^4-1= 243/3^3 = 243/27 = 9
jadi, rumus suku ke n yaitu
un = 243/3^n-1
obsen b