A 4-digit code is to be formed from the digits $0,1,2,3,4,5,6,7,8$ and 9 . No digit may be used more than once in any code. A code may start with 0 . (i) Find how many codes can be formed.
Explanation
To find the number of codes that can be formed, we need to calculate the number of permutations of 10 digits taken 4 at a time, since the order of the digits matters and no digit may be used more than once.
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