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What is the sum of digits of (9999999999)^3 ?

Is the answer 180 ?

Note by Sharath Chandar
2 years, 11 months ago

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how did u find that out ?? Sivaramakrishnan Sivakumar · 2 years, 11 months ago

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@Sivaramakrishnan Sivakumar For example take (99)^3. In this sum of the number (99) is 9+9=18. Now take the cube ,which is 970299. In this the sum (9+7+0+2+9+9) is 36. I used this in the question. (9999999999)^3 has 10 nines. Therefore the sum is 90. Hence the sum of the digits of (9999999999)^3 is 180. Sharath Chandar · 2 years, 11 months ago

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@Sharath Chandar take 9 and 9^3 , Your logic doesn't work ! Sivaramakrishnan Sivakumar · 2 years, 11 months ago

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@Sivaramakrishnan Sivakumar It works.. 9^3= 729. 7+2+9= 18 Sharath Chandar · 2 years, 11 months ago

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@Sharath Chandar oh..ya... then i will use a computer to check ! Sivaramakrishnan Sivakumar · 2 years, 11 months ago

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@Sivaramakrishnan Sivakumar You may not be able to!! Sharath Chandar · 2 years, 11 months ago

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