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A phone company is creating new, 7-digit phone numbers for a

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A phone company is creating new, 7-digit phone numbers for a [#permalink] New post 07 Oct 2005, 08:44
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A phone company is creating new, 7-digit phone numbers for a large corporation that just moved to town. The first three digits of each phone number are 312. The last four digits must contain a 1, 3, 5, 6, 7, or 9. If each number (1, 3, 5, 6, 7, or 9) is used only once, how many different phone numbers are possible?

A. 320
B. 360
C. 180
D. 120
E. 440
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 [#permalink] New post 07 Oct 2005, 09:16
B

I used the same method as chets

(6)(5)(4)(3) = 360
  [#permalink] 07 Oct 2005, 09:16
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