Suppose an American Express Travelers Cheque is numbered x392063210, where the first digit is obscured. What is the missing digit?
A) 1
B) 4
C) 8
D) The missing digit can't be determined.

Question

Quizplus · Accepted Answer

The missing digit is 1 because the sum of the digits in the odd positions (1 + 9 + 2 + 0 + 6 + 2 + 0 = 20) is divisible by 10, and the sum of the digits in the even positions (3 + 9 + 0 + 3 + 1 + 0 = 16) is also divisible by 10. Therefore, the missing digit must be 1 or 4, but since the first digit is obscured, it cannot be 4.

Suppose an American Express Travelers Cheque Is Numbered X392063210, Where