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# What is the sum of the digits in 10^50 - 74 ?

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Manager
Joined: 02 Jan 2009
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Location: India
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What is the sum of the digits in 10^50 - 74 ? [#permalink]

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10 Oct 2009, 22:06
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What is the sum of the digits in 10^50 - 74 ?

A. 424
B. 433
C. 440
D. 449
C. 467
[Reveal] Spoiler: OA

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Last edited by Bunuel on 07 Sep 2014, 09:02, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
Senior Manager
Joined: 31 Aug 2009
Posts: 417
Location: Sydney, Australia
Re: What is the sum of the digits in 10^50 - 74 ? [#permalink]

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10 Oct 2009, 22:12
May not be the most elegant method but here goes:

10^50 = 1 followed by 50 trailing 0's.
The resulting number is 48 9's followed by 26
So the number will be 2+6+48(9) = 2+6+432 = 440
ANS = C
Math Expert
Joined: 02 Sep 2009
Posts: 39622
What is the sum of the digits in 10^50 - 74 ? [#permalink]

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10 Oct 2009, 22:32
yangsta8 wrote:
What is the sum of the digits in 10^50 - 74 ?

A. 424
B. 433
C. 440
D. 449
C. 467

May not be the most elegant method but here goes:

10^50 = 1 followed by 50 trailing 0's.
The resulting number is 48 9's followed by 26
So the number will be 2+6+48(9) = 2+6+432 = 440
ANS = C

Well, think found more elegant solution:

10^50-76=10^2*10^48-10^2+26=10^2(10^48-1)+26 --> we'll have the number with 48 nines 2 zeros +26, so the number would be 48 nines and 26 at the end --> number of digits=48*9+2+6=440

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Manager
Joined: 15 Sep 2009
Posts: 135
Re: What is the sum of the digits in 10^50 - 74 ? [#permalink]

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11 Oct 2009, 08:06
I have solved the foll way :

100 - 74 = 26
1000 - 74 = 926

10^50 - 74 will have 48 9's and 26.so adding we get the sum of digits as 440

I will go with option C
Director
Joined: 01 Apr 2008
Posts: 881
Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014
Re: What is the sum of the digits in 10^50 - 74 ? [#permalink]

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11 Oct 2009, 10:40
One more way:)
10^50 has 51 digits... 10^50-76 will have 50 digits ( as the first digit '1' will be borrowed ) and the last two digits will be '2' and '6'. So we have 48*9 + 2 + 6 = 440
Manager
Joined: 04 Sep 2009
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Re: What is the sum of the digits in 10^50 - 74 ? [#permalink]

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12 Oct 2009, 08:50
Got there the same way as economist. For around 20 sec, though, pondered on why I was getting 448, then realised that I added 432 and 26, while should have 432+2+6
Director
Joined: 01 Apr 2008
Posts: 881
Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014
Re: What is the sum of the digits in 10^50 - 74 ? [#permalink]

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12 Oct 2009, 20:45
Got there the same way as economist. For around 20 sec, though, pondered on why I was getting 448, then realised that I added 432 and 26, while should have 432+2+6

I know , these are the silly silly silly mistakes that suck !!
Senior Manager
Joined: 18 Aug 2009
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Schools: UT at Austin, Indiana State University, UC at Berkeley
WE 1: 5.5
WE 2: 5.5
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Re: What is the sum of the digits in 10^50 - 74 ? [#permalink]

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12 Oct 2009, 21:26
Looks like the solution offered by Economist is shortest, thus saves the most time.
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Manager
Joined: 12 Oct 2009
Posts: 115
Re: What is the sum of the digits in 10^50 - 74 ? [#permalink]

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13 Oct 2009, 10:50
Economist wrote:
Got there the same way as economist. For around 20 sec, though, pondered on why I was getting 448, then realised that I added 432 and 26, while should have 432+2+6

I know , these are the silly silly silly mistakes that suck !!

did the same but I was adding 432+26 =458 and it was not in option

Regards
Asterix
Remember the golden rule "2+2 = 4"
Manager
Joined: 18 Jul 2009
Posts: 169
Location: India
Schools: South Asian B-schools
Re: What is the sum of the digits in 10^50 - 74 ? [#permalink]

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13 Oct 2009, 11:11
9 x 48 +2+6 = 440
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Bhushan S.
If you like my post....Consider it for Kudos

Senior Manager
Joined: 21 Jul 2009
Posts: 251
Location: New York, NY
Re: What is the sum of the digits in 10^50 - 74 ? [#permalink]

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09 Nov 2009, 09:58
C.

99,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,926

math is a bitch
Re: What is the sum of the digits in 10^50 - 74 ?   [#permalink] 09 Nov 2009, 09:58
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