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# What is the sum of all digits for the number (10^50) -74

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Director
Joined: 17 Oct 2005
Posts: 938
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Kudos [?]: 70 [0], given: 0

What is the sum of all digits for the number (10^50) -74 [#permalink]  07 Jan 2006, 23:13
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What is the sum of all digits for the number (10^50) -74?
Director
Joined: 17 Oct 2005
Posts: 938
Followers: 1

Kudos [?]: 70 [0], given: 0

old dream can you elaborate, i dont follow. thanks
CEO
Joined: 20 Nov 2005
Posts: 2910
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008
Followers: 19

Kudos [?]: 132 [0], given: 0

10^50 = 1000......000 There are 50 zeros and a single 1

Subtracting 74 from this will yield
999999.........926
Now this number has 50 digits. 48 of them are 9 and last two are 2 and 6

So sum = 48*9 + 2+ 6 = 440
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

Director
Joined: 17 Oct 2005
Posts: 938
Followers: 1

Kudos [?]: 70 [0], given: 0

thanks guys, the oa is indeed 440
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