To determine:The check digit of an ISSN that has these initial 7 digits 1553-734

glasskerfu 2021-04-25 Answered
To determine:The check digit of an ISSN that has these initial 7 digits 1553-734
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Expert Answer

Yusuf Keller
Answered 2021-04-27 Author has 90 answers
Formula used:
An ISSN consists of two blocks of four digits. The last digit in the second block is a check digit. This check digit is determined by the congruence
d83d1,+4d2+5d3+6d4+7d5+8d6+9d7±od{11}
When d810±od{11}, we use the letter X to represent dg in the code.
Insert the digits of 1553 — 734 into the congruence
d83d1,+4d2+5d3+6d4+7d5+8d6+9d7±od{11}.
This gives,
d831+45+55+63+77+83+94±od{11}
d83+20+25+18+49+24+36±od{11}
d8175±od{11}
d810±od{11}
Hence, the check digit is X.
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