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Un=3+9n-9=9n-6=237
9n = 237 + 6
n = 243/9 = 27
jadi 237 merupakan suku ke-27
237 = 3 + (n-1) 9
237 = 3 + 9n -9
237 = -6 +9n
6 + 237 = 9n
243 = 9n
243 : 9 = n
27 = n
jadi suku ke 27 adalah 237