Mathematics, 13.09.2019 19:20 smilingntn33p7pqpp

How many phone numbers are possible in the (770) area code if:
for the form abc-, a is restricted to numbers 2-9. b, c, and x can be digit 0-9. also, the number 867-5309 is not used.
a. 6,999,999
b. 7,000,000
c. 7,999,999
d. 8,000,000

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How many phone numbers are possible in the (770) area code if:
for the form abc-, a is restri...

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