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Here is the formula of the checking number in your ID card,
Let the ID card no. be
1st letter (X) - A,B,C,D,E,F, G ... etc
2nd - 7th digit (N) - N1,N2,N3,N4,N5,N6
8 digit - inside (N7) ... the so called "checking number"
In calculation, we put the 1st letter a value by rule as below
A=1, B=2, C=3, etc
Then, calculate a "T" value where
T = 8*X + 7*N1 + 6*N2 + 5*N3 + 4*N4 + 3*N5 + 2*N1
Divide T by 11, get the remainder, say R
The checking number, N8 = 11 - R (the number inside bracket)
If the calculated N8=10, it means A
If the calculated N8=11, it means 0
So, it is a Maths! Not a bad spell or magic!
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