Question

Using divisibility test, determine $7183895$ is divisible by $11$.

Answer 1

The rule for the divisibility of $11$states that if the difference between the sums of the alternate digits of the given number is either $0$ or divisible by $11$, then the number is divisible by $11$.
The sum of alternative digit in $7183895$ are $7+8+8+5=28$ and $1+3+9=13$
The difference between two are: $28-13=15$
$15$ is not divisible by $11$.
Hence $7183895$ is not divisible by $11$.