Computer Science for IGCSE & O level - Data Transmission (Section 1 - No. 15)
In the ISBN-13 calculation, what is the weight assigned to the first digit?
1
3
7
9
توضیح
In the ISBN-13 calculation, the first digit is weighted by 1, the second by 3, the third by 1, and so on, alternating between 1 and 3.