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237=3+(n-1)9
237=9n-6
9n=243
n=27
a = 3
b = 9
Un = a+(n-1)b
237 = 3+(n-1)9
237 = 3+9n-9
9n = 237-3+9
9n = 243
n = 27
jadi 237 adalah suku ke-27