How many number of times will the digit 7' be written when : PS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 16 Jan 2017, 15:10

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# How many number of times will the digit 7' be written when

Author Message
Director
Joined: 14 Oct 2003
Posts: 587
Location: On Vacation at My Crawford, Texas Ranch
Followers: 1

Kudos [?]: 48 [0], given: 0

How many number of times will the digit 7' be written when [#permalink]

### Show Tags

04 Nov 2005, 14:45
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

How many number of times will the digit â€˜7' be written when listing the integers from 1 to 1000?

(1) 271 (2) 273 (3) 252 (4) 304 (5) 300
_________________

"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: 24 Oct 2005
Posts: 575
Location: NYC
Followers: 1

Kudos [?]: 59 [0], given: 0

### Show Tags

04 Nov 2005, 14:49
300

1 -100 -- 10 times..
100-200 --> 9 +10 times.. (17... 97, 70-79)
so.. from 100-1000 excluding 700's its written 190 times..
700-800 --> 100 times..
so.. 10 +190 +100 = 300 times
_________________

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

VP
Joined: 22 Aug 2005
Posts: 1120
Location: CA
Followers: 1

Kudos [?]: 102 [0], given: 0

### Show Tags

04 Nov 2005, 15:14
300

1 - 100 : 20 7s
7, 17,27,....,70,71,72,...77,78,79....,97

similarly:
101 - 200 : 20
201 - 300 : 20
301 - 400 : 20
401 - 500: 20
501 - 600 : 20
601 - 700 : 21 (700 has 7)
701 - 800 : 99(all number have 7) + 20 (regular 7s)
801 - 900 : 20
901 - 1000: 20

total : 300
Director
Joined: 14 Oct 2003
Posts: 587
Location: On Vacation at My Crawford, Texas Ranch
Followers: 1

Kudos [?]: 48 [0], given: 0

### Show Tags

04 Nov 2005, 15:43
Good work - no surprise - OA is 300

Underpants for everyone!
_________________

"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: 793
Followers: 2

Kudos [?]: 24 [0], given: 0

### Show Tags

04 Nov 2005, 15:59
E) 300

7XX - 100
X7X - 100 (10 times in every 100 - 70-79;170-179...)
XX7 - 100 (10 times in every 100 - 07,17,27...107,117...)
Director
Joined: 14 Oct 2003
Posts: 587
Location: On Vacation at My Crawford, Texas Ranch
Followers: 1

Kudos [?]: 48 [0], given: 0

### Show Tags

04 Nov 2005, 16:03
gsr wrote:
E) 300

7XX - 100
X7X - 100 (10 times in every 100 - 70-79;170-179...)
XX7 - 100 (10 times in every 100 - 07,17,27...107,117...)

Your Avatar (or my old avatar) confuses me into thinking, initially, that your posts are my posts.
_________________

"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: 793
Followers: 2

Kudos [?]: 24 [0], given: 0

### Show Tags

04 Nov 2005, 16:10
Titleist wrote:
Your Avatar (or my old avatar) confuses me into thinking, initially, that your posts are my posts.

I will give this dude some rest soon
Director
Joined: 14 Oct 2003
Posts: 587
Location: On Vacation at My Crawford, Texas Ranch
Followers: 1

Kudos [?]: 48 [0], given: 0

### Show Tags

04 Nov 2005, 16:12
gsr wrote:
Titleist wrote:
Your Avatar (or my old avatar) confuses me into thinking, initially, that your posts are my posts.

I will give this dude some rest soon

No No No! That's not what I mean't!
_________________

"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: 793
Followers: 2

Kudos [?]: 24 [0], given: 0

### Show Tags

04 Nov 2005, 16:17
Titleist wrote:
gsr wrote:
Titleist wrote:
Your Avatar (or my old avatar) confuses me into thinking, initially, that your posts are my posts.

I will give this dude some rest soon

No No No! That's not what I mean't!

Anyway, I was planning to. Coz we were using him continuously for sometime now
VP
Joined: 22 Aug 2005
Posts: 1120
Location: CA
Followers: 1

Kudos [?]: 102 [0], given: 0

### Show Tags

04 Nov 2005, 16:18
gsr wrote:
E) 300

7XX - 100
X7X - 100 (10 times in every 100 - 70-79;170-179...)
XX7 - 100 (10 times in every 100 - 07,17,27...107,117...)

Your approach is alot better than manual counting(that i did) Good one.
Director
Joined: 14 Oct 2003
Posts: 587
Location: On Vacation at My Crawford, Texas Ranch
Followers: 1

Kudos [?]: 48 [0], given: 0

### Show Tags

04 Nov 2005, 16:31
gsr wrote:
Titleist wrote:
gsr wrote:
Titleist wrote:
Your Avatar (or my old avatar) confuses me into thinking, initially, that your posts are my posts.

I will give this dude some rest soon

No No No! That's not what I mean't!

Anyway, I was planning to. Coz we were using him continuously for sometime now

I wonder what the guy in the avatar would think or say if he found out that we were using his picture.
_________________

"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

04 Nov 2005, 16:31
Display posts from previous: Sort by