Perhatikan angka-angka dibawah ini !!!

1 X 8 + 1 = 9

12 X 8 + 2 = 98

123 X 8 + 3 = 987

1234 X 8 + 4 = 9876

12345 X 8 + 5 = 98765

123456 X 8 + 6 = 987654

1234567 X 8 + 7 = 9876543

12345678 X 8 + 8 = 98765432

123456789 X 8 + 9 = 987654321
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