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69 = 6 + (10-1)b
69 = 6 + (9)b
63 = 9b
b = 7.
beda = 7 rumus
suku ke n = a
+(n-1)b
un = 6 + (n-1)7
un = 6 + 7n - 7
suku ke 101
u101 = 7 x 101 - 1
u101 = 707 - 1
u101 = 706.