@Sivaramakrishnan Sivakumar
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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.
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Sharath Chandar
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2 years, 9 months ago

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TopNewesthow did u find that out ?? – Sivaramakrishnan Sivakumar · 2 years, 9 months ago

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– Sharath Chandar · 2 years, 9 months 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.Log in to reply

– Sivaramakrishnan Sivakumar · 2 years, 9 months ago

take 9 and 9^3 , Your logic doesn't work !Log in to reply

– Sharath Chandar · 2 years, 9 months ago

It works.. 9^3= 729. 7+2+9= 18Log in to reply

– Sivaramakrishnan Sivakumar · 2 years, 9 months ago

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

– Sharath Chandar · 2 years, 9 months ago

You may not be able to!!Log in to reply