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U237=3+(237-1)9
U237=3+(236)9
U237=3+2124
U237=2127
a=suku pertama
b=beda
beda= 9
barisan aritmatika
Un= a+(n-1)b
237=3+(n-1)9
(n-1)9= 237-3
9n-9= 234
9n= 234+9
n= 243/9
n= 27
jadi 237 adalah suku ke 27