A six-digit code is used to distinguish between different


A six?-digit code is used to distinguish between different regions. The code uses numbers between 1 and 7?, inclusive.

a. How many different codes are available for? use? (Assume that any six?-digit number can be used as a? code.)

b. The first three digits of a code for a particular region are 442

2. 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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Applied Statistics: A six-digit code is used to distinguish between different
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