The following question was asked in a competitive exam for which I am preparing and I was unable to solve it (in fact I am completely clueless about it).
So, I am asking for help here.
Given a number with 1998 digits which is divisible by 9. Let x be sum of its digits and y be sum of digits of x and z be sum of digits of y. Find value of z.
d none of these
I am completely clueless on how to approach this and would be really thankful for any help received.