Question: ZIP codes. An eight-digit code is used to distinguish between different regions. The code uses numbers between 1 and 9, inclusive. a. How many different

ZIP codes. An eight-digit code is used to distinguish between different regions. The code uses numbers between 1 and 9, inclusive.

a. How many different codes are available for use?

(Assume that any eight-digit number can be used as a code.)

b. The first three digits of a code for a particular region are 333. If no other region has these first three digits as part of its code, how many codes can exist in this region?

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