Question: A fivefive - digit code is used to distinguish between different regions. The code uses numbers between 1 and 6 , inclusive. a . How

A fivefive-digit code is used to distinguish between different regions. The code uses numbers between 1 and 6, inclusive.
a.
How many different codes are available for use? (Assume that any five-digit number can be used as a code.)
b.
The first three digits of a code for a particular region are 232. 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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