# Am I thinking correctly ?

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

Note by Sharath Chandar
4 years, 1 month ago

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how did u find that out ??

- 4 years, 1 month ago

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.

- 4 years, 1 month ago

take 9 and 9^3 , Your logic doesn't work !

- 4 years, 1 month ago

It works.. 9^3= 729. 7+2+9= 18

- 4 years, 1 month ago

oh..ya... then i will use a computer to check !

- 4 years, 1 month ago

You may not be able to!!

- 4 years, 1 month ago