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242 = 2(3^n -1)/1-3
242 = 2(3^n -1)/-2
242 = 3^n - 1/-1
242*1 = 3^n -1
242 = 3^n - 1 jadi, n adalah 5..
242+1 = 3^n
243 = 3^n
243 = 3^5