Question

Using the divisibility test, determine which of the following number is divisible by 11:

10000001

Answer 1

Sum of the digits at odd places = 1

Sum of the digits at even places = 1

Difference = 1 − 1 = 0

As the difference between the sum of the digits at odd places and the sum of the digits at even places is 0, therefore, 10000001 is divisible by 11.