The second digit can be any of the 10 digits except the digit used in position 1 since no repetition of the digits is allowed, hence the 9 choices. b) In the diagram below, the first digit of the number to be formed can be any of the 10 digits, hence the 10 choices.When repetition is allowed, the total number N of ID cards is given by the total numbers of 5 digit numbers that can formed and is given by: Hence the 10 choices for each digit of the number to be formed since repetition of the digits from 0 to 9 is allowed.
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