yes i was take a set of number eg 0070216045
Code Weight Weighted Value
0X10 = 0
0x9 = 0
7x8 = 56
0x7 = 0
2x6 = 12
1x5 = 5
6x4 = 24
0x3 = 0
4x2 = 8
5x1 = 5
Weighted Sum = 110

Since the weighted sum calculated = 110, the weighted sum modulus 11 is therefore zero, it a valid isbn

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