Sum the Digits... Then Sum Them Again

( 1 0 2016 + 5 ) 2 = 225 N (10^{2016}+5)^2=225N

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


The answer is 16.

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1 solution

汶汶 樂
Jan 14, 2016

nice solution, I myself had followed the same process

Atul Shivam - 5 years, 5 months ago

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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

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And then revealed the solutions?

Kushagra Sahni - 5 years, 5 months ago

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@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

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@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

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