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bilangan kedua = n + 2
bilangan ketiga = n + 4
b) 117 = n + n+ 2 + n + 4
117 = n + n + n + 2 + 4
117 = 3n + 6
3n = 117-6
3n = 111
n = 37
bilangan pertama = n = 37
bilangan kedua = n + 2 = 37 + 2 = 39
bilangan ketiga = n + 4 = 37 + 4 = 41