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7_13_19_25
6 _ 6 _ 6
sama pada tingkat ke 2 jadi
a=1
b=7
c=6
Un=a +(n-1)b + (n-1) (n-2) c /2
Un= 1+ (n-1)7+ (n-1) (n-2) 6/2
Un= 1+ 7n-7 +(n-1) (n-2) 3
Un= 1+7n-7+(n²-2n-n+2)3
Un=1+7n-7+(n²-3n+2)3
Un= 1+7n-7+3n²-9n+6
Un= 3n²+7n-9n+1-7+6
Un= 3n²-2n