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15 July, 06:22

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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  1. 15 July, 09:39
    0
    8C1*2C1*9C1

    and the answer is 160
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