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PS:Source unknown. [#permalink]

13 Jun 2010, 22:34

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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:

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Re: PS:Source unknown. [#permalink]

14 Jun 2010, 06:01

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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:

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.

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Re: PS:Source unknown. [#permalink]

14 Jun 2010, 09:13

Thanks a lot.
The explanation was really helpful and easy to understand.

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Re: PS:Source unknown. [#permalink]

14 Jun 2010, 14:36

0036 isn't a four digit number?

what about negatives?
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[#permalink]

15 Jun 2010, 06:57

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: 351

Location: United States

GMAT 1: 660 Q42 V39
GMAT 2: 730 Q48 V42

GPA: 3.49

WE: Analyst (Insurance)

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Kudos [?]: 40 [0], given: 17

Re: PS:Source unknown. [#permalink]

15 Jun 2010, 07:24

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, 07:24

		Similar topics	Author	Replies	Last post
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		Please mention the source of PS/DS/SC/CR/RC	javed	2	03 May 2007, 02:30
	1	PS:Source unknown.	sivangi	5	13 Jun 2010, 22:34
	1	Unknown term.	Yalephd	3	09 Oct 2010, 09:47
	1	Looking for a problem from diff source similar to OG PS # 8	Big4Advisory	4	18 Feb 2013, 18:09

PS:Source unknown.

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