Question

Test the divisibility of the following numbers by $11$.

$2784$

Answer 1

A number is divisible by $11$ if the difference between the sum of the alternate digits is $0$ or a multiple of $11$.

In the given number $2784$,

the difference between the sum of the alternate digits is $\left(7+4\right)-\left(2+8\right)=1$,which is not divisible by $11$

Hence, the given number $2784$ will not divisible by $11$.