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Beda (dari ..1) 9,13,17 ...2
Beda (dari ..2) 4,4 ...3
a = 5 b= 9 c=4
Un = a+(n-1)b + {(n-1)(n-2)c}/2!
Un = 5+(n-1)9 + {(n^2-3n+2)4}/2
Un = 5 +9n - 9 + 2n^2 -6n + 4
Un = 2n^2+3n