Sum the Digits... Then Sum Them Again

Number Theory Level 4

$(10^{2016}+5)^2=225N$

If $S$ is the sum of digits of $N$ , then find the sum of digits of $S$ .

1 solution

汶汶樂
Jan 14, 2016

nice solution, I myself had followed the same process

Atul Shivam - 5 years, 5 months ago

I also did the same way but but entered the answer as sum of digits of N instead of S :(

Samarth Agarwal - 5 years, 5 months ago

And then revealed the solutions?

Kushagra Sahni - 5 years, 5 months ago

@Kushagra Sahni – ha...ha...ha lol :p

Atul Shivam - 5 years, 5 months ago

I also did the same mistake.......and then my patience answered and I revealed the solutions :p

Rishabh Jain - 5 years, 4 months ago

@Rishabh Jain – hehehe lol!!!!

Atul Shivam - 5 years, 4 months ago

Nice solution but can't we take LHS and RHS modulo 9?

Priyanshu Mishra - 5 years, 4 months ago