refer to an 8-digit student id at a large university. The eighth digit is a check
digit equal to the sum of the ﬁrst seven digits modulo 7.
-Suppose the ﬁrst digit of the student id X123 4566 is illegible (indicated by X). Can you tell what the ﬁrst digit has to be?

Question

Quizplus · Accepted Answer

The Answer of refer to an 8-digit student id at a large university. The eighth digit is a check
digit equal to the sum of the ﬁrst seven digits modulo 7.
-Suppose the ﬁrst digit of the student id X123 4566 is illegible (indicated by X). Can you tell what the ﬁrst digit has to be?

Refer to an 8-Digit Student Id at a Large University