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

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Joined: 29 Jan 2005
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A phone company is creating new, 7-digit phone numbers for a [#permalink]  07 Oct 2005, 07:44
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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
Manager
Joined: 28 Jun 2005
Posts: 66
Location: New York, NY
Followers: 1

Kudos [?]: 2 [0], given: 0

B

I used the same method as chets

(6)(5)(4)(3) = 360
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