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# Starting with 1, positive integers are written one after the

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Director
Joined: 21 Aug 2005
Posts: 789
Starting with 1, positive integers are written one after the [#permalink]

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02 Nov 2005, 23:55
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Starting with 1, positive integers are written one after the other. What is the 40,000th digit that will be written?
A) 2
B) -2
C) 3
D) 6
E) None of the above ( )

Need proof that you worked all the 40,000!
SVP
Joined: 24 Sep 2005
Posts: 1885
Re: Patience is a virtue! - PS [#permalink]

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03 Nov 2005, 00:00
gsr wrote:
Starting with 1, positive integers are written one after the other. What is the 40,000th digit that will be written?
A) 2
B) -2
C) 3
D) 6
E) None of the above ( )

Need proof that you worked all the 40,000!

oh my , one of the typically advanced arithmetic problems which I did try before but ................ I TOTALLY forget how to solve it LOL ...ahem, let me try to wake my subconsciouness up first
Director
Joined: 21 Aug 2005
Posts: 789
Re: Patience is a virtue! - PS [#permalink]

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03 Nov 2005, 00:02
laxieqv wrote:
oh my , one of the typically advanced arithmetic problems which I did try before but ................ I TOTALLY forget how to solve it LOL ...ahem, let me try to wake my subconsciouness up first

While you try to wake your subconsciousness, let me put mine to 'sleep' coz i got work tomorrow! Happy counting!!
Director
Joined: 14 Oct 2003
Posts: 583
Location: On Vacation at My Crawford, Texas Ranch
Re: Patience is a virtue! - PS [#permalink]

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03 Nov 2005, 00:03
gsr wrote:
Starting with 1, positive integers are written one after the other. What is the 40,000th digit that will be written?
A) 2
B) -2
C) 3
D) 6
E) None of the above ( )

Need proof that you worked all the 40,000!

my my my gsr you are a busy bee tonight! you must had a tough day at work and are intent on distributing some real punishment on the 2 other people on this board.
_________________

"Wow! Brazil is big." â€”George W. Bush, after being shown a map of Brazil by Brazilian president Luiz Inacio Lula da Silva, Brasilia, Brazil, Nov. 6, 2005

http://www.nytimes.com/2005/11/21/international/asia/21prexy.html

Director
Joined: 21 Aug 2005
Posts: 789
Re: Patience is a virtue! - PS [#permalink]

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03 Nov 2005, 00:10
Titleist wrote:
my my my gsr you are a busy bee tonight! you must had a tough day at work and are intent on distributing some real punishment on the 2 other people on this board.

LOL!
Good Night! See ya tomorrow!
VP
Joined: 22 Aug 2005
Posts: 1112
Location: CA

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03 Nov 2005, 00:26
E. 1

numbers total number of digits
1-9 9*1 = 9
10-99 90*2 = 180
100-999 900*3 = 2700
1000-9999 9000*4 = 36000
10000-99999 90000 * 5 = 450000

first 4 if written one after other will have : 9+180+2700+36000 = 38889 digits

rest of the 40000 - 38889 = 1111 digit comes from numbers 10000-99999 range

each of these numbers have 5 digits so we will need ceil(1111/5) = 223 numbers

last number: 99999 + 223 = 10222
40000 digit: 1
SVP
Joined: 24 Sep 2005
Posts: 1885

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03 Nov 2005, 03:08
duttsit wrote:
E. 1

numbers total number of digits
1-9 9*1 = 9
10-99 90*2 = 180
100-999 900*3 = 2700
1000-9999 9000*4 = 36000
10000-99999 90000 * 5 = 450000

first 4 if written one after other will have : 9+180+2700+36000 = 38889 digits

rest of the 40000 - 38889 = 1111 digit comes from numbers 10000-99999 range

each of these numbers have 5 digits so we will need ceil(1111/5) = 223 numbers

last number: 99999 + 223 = 10222
40000 digit: 1

again duttsit, you're too keen .....but , it's 9999 instead of 99999
Still do I have an intuition that my teacher solved it a very different, short and sweet way ....I'll try to recall
Director
Joined: 24 Oct 2005
Posts: 572
Location: NYC

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03 Nov 2005, 12:28
I got it using brute force.. You guys correct me if I am wrong..

123456789123... -- the 10th digit is 1.. the 20th digit wil be 2.. the 30th digit will be 3.. and so on.. till we get to 100th digit which will again be 1..

40,000th digit is a multiple of 100.. 100+100+100 *400 times.. gets me 40,000.. so the 40,000th digit should be 1.
_________________

Success is my only option, failure is not -- Eminem

Director
Joined: 21 Aug 2005
Posts: 789

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03 Nov 2005, 13:44
Good job guys!
OA is E ('1')
03 Nov 2005, 13:44
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