Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 30 May 2017, 02:32

### 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

# A code is defined to be a sequence of three different

Author Message
Senior Manager
Joined: 10 Dec 2004
Posts: 272
Followers: 2

Kudos [?]: 172 [0], given: 0

A code is defined to be a sequence of three different [#permalink]

### Show Tags

11 Jan 2005, 09:00
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A code is defined to be a sequence of three different numbers chosen from 1 to 9, the first cannot be 0 or 1, the second must be either 0 or 1, the second and the third cannot be both 0. How many such codes exist?
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4288
Followers: 44

Kudos [?]: 469 [0], given: 0

### Show Tags

11 Jan 2005, 09:05
pb_india wrote:
A code is defined to be a sequence of three different numbers chosen from 1 to 9, the first cannot be 0 or 1, the second must be either 0 or 1, the second and the third cannot be both 0. How many such codes exist?

Should the first sentence not be: A code is defined to be a sequence of three different numbers chosen from 0 to 9
_________________

Best Regards,

Paul

Senior Manager
Joined: 10 Dec 2004
Posts: 272
Followers: 2

Kudos [?]: 172 [0], given: 0

### Show Tags

11 Jan 2005, 09:07
Paul, yes. it is 0..9
Sorry for the typo.
Director
Joined: 07 Jun 2004
Posts: 612
Location: PA
Followers: 7

Kudos [?]: 795 [0], given: 22

### Show Tags

11 Jan 2005, 09:14
I am gettgin 792

whats the OA

thanks
Senior Manager
Joined: 10 Dec 2004
Posts: 272
Followers: 2

Kudos [?]: 172 [0], given: 0

### Show Tags

11 Jan 2005, 09:19
Just don't post the answer.. Can you post how you got to the final number?

I will post OA in some time.
Director
Joined: 03 Nov 2004
Posts: 856
Followers: 2

Kudos [?]: 54 [0], given: 0

### Show Tags

11 Jan 2005, 09:24
152
When the second term is 0: 8 * 1 * 9 = 72
When the second term is 1: 8 * 1 * 10 = 80
Director
Joined: 21 Sep 2004
Posts: 607
Followers: 1

Kudos [?]: 35 [0], given: 0

### Show Tags

11 Jan 2005, 09:34
oops. i took its 9 numbers in all.. and also.. didn't read hte last half where cannot have two 0's together..
without that.. tis 152?
Manager
Joined: 01 Jan 2005
Posts: 166
Location: NJ
Followers: 1

Kudos [?]: 4 [0], given: 0

### Show Tags

11 Jan 2005, 12:22
A code is defined to be a sequence of three different numbers chosen from 1 to 9, the first cannot be 0 or 1, the second must be either 0 or 1, the second and the third cannot be both 0. How many such codes exist?

When the second term is 0: 8 * 1 * 9 = 72
When the second term is 1: 8 * 1 * 10 = 80

so the scope for second and third cannot be 0 doesn't exist.

Is the question right?
Director
Joined: 03 Nov 2004
Posts: 856
Followers: 2

Kudos [?]: 54 [0], given: 0

### Show Tags

11 Jan 2005, 12:33
Vijo, I am not sure if I get what you are trying to get at but the question seems to be good.
Senior Manager
Joined: 30 Dec 2004
Posts: 294
Location: California
Followers: 1

Kudos [?]: 2 [0], given: 0

### Show Tags

11 Jan 2005, 13:22
Good question...I just have a quick coneptual question...when do you know when to multiply the various outcomes or add them...I always have a problem with this....so what I mean is in this case we addded the 72 possibilities with 80 posiiblities to get 152 but under what circumstances do you multiply them...

_________________

"No! Try not. Do. Or do not. There is no try.

11 Jan 2005, 13:22
Display posts from previous: Sort by