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OpenStudy (anonymous):
A telephone number consists of a sequence of seven digits not starting with a 0 or a 1. How many phone numbers begin with either 7342, 7423, or 7224? a. 27,000 numbers b. 2,187 numbers c. 1,000 numbers d. 90 numbers e. 3,000 numbers
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OpenStudy (ikram002p):
7 number ******* u can make 8×10^6 phone numbers
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