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Mathematics, 27.08.2019 02:30 zayboogey04

Before 1995, three-digit area codes for the united states had the following restrictions:
(a) neither 0 nor 1 could be used as the first digit.
(b) 0 or 1 had to be used for the second digit.
(c) there were no restrictions on the third digit.
how many different area codes were possible?

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Before 1995, three-digit area codes for the united states had the following restrictions:
(a)...

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