Log in to add a comment

Log in to add a comment

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.

A* simple and ELEGANT way of checking if one number is divisble by 11 is to sum the alternate digits of this number.*

*sum of digits starting with 7 = 7 + 9 + 2 + 2 = 20*

*Sum of digits starting with 8 = 8 + 5 + 7 = 20*

*Difference between these two sums = 0*

*Rule is that if this difference is divisible by 11, then the original number is divisible by 11.*

*Hence it is divisible by 11*