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Sum of digits?

The sum of digits of the number \(2^{2000}\times 5^{2004}\)?

I am not getting to even solve such problems. Please put some of the general methods and example if possible with their proper solutions.

Note by Puneet Pinku
3 weeks, 5 days ago

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Hi well i m not sure that my answer is correct (as i m in class9) according to me solution is

2^2000 × 5^2004 =2^2000×5^2000 × 5^4 =(2^2000×5^2000) + 25×25 ... '+' sign for sum of digits

=10^2000 × 625

Sum of digits = 626 Mafia MaNiAc · 3 weeks, 4 days ago

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@Mafia MaNiAc CORRECTION : ...... = 2^2000×5^2000×5^4 =10^2000 × 625 THEREFORE DIGIT SUM = 6+2+5 =13 ..... Q.E.D. Mafia MaNiAc · 3 weeks, 1 day ago

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Ah! I see but don't you think the answer in this case becomes 6+2+5+1=14. By the way awesome solution.. Thanks!!! Puneet Pinku · 3 weeks, 3 days ago

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@Puneet Pinku Can u pls tell me how do u add "image" while giving question/problem? Mafia MaNiAc · 3 weeks ago

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