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