PS:Source unknown. : GMAT Problem Solving (PS)
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# PS:Source unknown.

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Intern
Joined: 13 Jul 2009
Posts: 3
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Kudos [?]: 0 [0], given: 6

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13 Jun 2010, 21:34
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Question Stats:

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How many four-digit numbers that do not contain the digits 3 or 6 are there?

(A) 2401

(B) 3584

(C) 4096

(D) 5040

(E) 7200

[Reveal] Spoiler:
B
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Joined: 25 Jun 2009
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14 Jun 2010, 05:01
1
KUDOS
sivangi wrote:
How many four-digit numbers that do not contain the digits 3 or 6 are there?

(A) 2401

(B) 3584

(C) 4096

(D) 5040

(E) 7200

[Reveal] Spoiler:
B

Welcome to the club..!

We can have 7 digits ( 1,2,4,5,7,8,9) for the first place ( thousand's place).
and similarly 8 digits for hundred's, tenth's and unit digit. ( 0,1,2,4,5,7,8,9)

So in total 7*8*8*8= 3584

Hence B

Hope this helps.
Intern
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14 Jun 2010, 08:13
Thanks a lot.
The explanation was really helpful and easy to understand.
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GMAT 1: 660 Q42 V39
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14 Jun 2010, 13:36
0036 isn't a four digit number?

_________________

He that is in me > he that is in the world. - source 1 John 4:4

Intern
Joined: 13 Jul 2009
Posts: 3
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Kudos [?]: 0 [0], given: 6

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15 Jun 2010, 05:57
0036 is not a four-digit number,it is a two-digit number.The question asks for a four-digit number that do not contain 3 or 6.
Senior Manager
Status: Yeah well whatever.
Joined: 18 Sep 2009
Posts: 345
Location: United States
GMAT 1: 660 Q42 V39
GMAT 2: 730 Q48 V42
GPA: 3.49
WE: Analyst (Insurance)
Followers: 5

Kudos [?]: 72 [0], given: 17

### Show Tags

15 Jun 2010, 06:24
i realize the question said no 3's or 6's but i just used 0036 as an example. thanks. i appreciate the clarity.
_________________

He that is in me > he that is in the world. - source 1 John 4:4

Re: PS:Source unknown.   [#permalink] 15 Jun 2010, 06:24
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