Question

Using the divisibility test determine which of the following numbers are divisible by 11
$10000001$

Answer 1

$10000001:-$
Sum of the given digits at odd places = $1$
Sum of the given digits at even place= $1$
Difference= $1-1=0$
As the difference between the sum of the digits at odd places and the sum of the digits at even place is $0$.
Therefore, $10000001$ is divisible by $11$