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How many four digit numbers that do not contain the digits 3

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How many four digit numbers that do not contain the digits 3 [#permalink] New post 09 Nov 2004, 07:19
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

Please explain
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 [#permalink] New post 09 Nov 2004, 07:26
I choose B.

If we exclude 3 and 6 there are still 8 digits to pick from except for the thousandth digit (only 7)

So 7.8.8.8 = 3584
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 [#permalink] New post 09 Nov 2004, 07:38
Got it. Thanks Twixt.!
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  [#permalink] 09 Nov 2004, 07:38
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