how many phone numbers are possible in the 303 area code?

 using p(n,r)n! over (n-r)! 

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Area code is followed by 7 digits, so mathematically all numbers from 303 000 0000 up to 303 999 9999 are possible, that's 10,000,000 (ten million) numbers. However, there are restrictions on the leading 3 digits, being the local zone identity.

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