Question

No of positive integers less than 1000000 sum of digits is 19

Answer 1

I tried to answer it by using stars and bars combinatorics method.

The question says that sum of 66 digit numbers { considering the number as abcdefabcdef } is 19.

Hence, I can write it as a+b+c+d+e+f=19a+b+c+d+e+f=19 ,but this assumes that a,b,c,d,e,f>=0a,b,c,d,e,f>=0 .