From 100 to 999, how many integers do not include 2 nor 5 : PS Archive
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# From 100 to 999, how many integers do not include 2 nor 5

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CEO
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From 100 to 999, how many integers do not include 2 nor 5 [#permalink]

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18 Dec 2003, 06:00
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From 100 to 999, how many integers do not include 2
nor 5 in the digit?

any non brute force approaches?
Intern
Joined: 27 Nov 2003
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Location: Moscow
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Kudos [?]: 1 [0], given: 0

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18 Dec 2003, 06:51
Is it 7*8*8?

Possibilities for the first digit: 1,3,4,6,7,8,9 = 7 variations
For the second and third digit: 0,1,3,,4,6,7,8,9 = 8 variations
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Director
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Kudos [?]: 24 [0], given: 0

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18 Dec 2003, 12:40
Anvar must be right-- seems like a pretty simple question.
Intern
Joined: 22 Nov 2003
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Kudos [?]: 3 [0], given: 0

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18 Dec 2003, 13:53
Titleist wrote:
I agree! 7*8*9=448

I am sure that you thought 7*8*8 ....
Director
Joined: 14 Oct 2003
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Kudos [?]: 49 [0], given: 0

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18 Dec 2003, 13:57
Yes-thanks for pointing that out!
18 Dec 2003, 13:57
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