None.
Nine digit number cannot be formed using only five digits 1,2,3,4,5 in the case none of the digits can repeat.
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Egad! I misread the question, apologies to the questioner.
And thanks to Miroslav.
If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.
There are 2000 such numbers.
64 if repetition is allowed.24 if repetition is not allowed.
There are 10 to the 10th power possibilities of ISBN numbers if d represents a digit from 0 to 9 and repetition of digits are allowed. That means there are 10,000,000,000 ISBN numbers possible.
10^7 if the repetition of digits is allowed. 9*8*7*6*5*4*3 , if the repetition of digits is not allowed.
If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.
There are 2000 such numbers.
64 if repetition is allowed.24 if repetition is not allowed.
There are 2000 such numbers.
5 ^12
If repetition of digits is allowed, then 56 can.If repetition of digits is not allowed, then only 18 can.
24 three digit numbers if repetition of digits is not allowed. 4P3 = 24.If repetition of digits is allowed then we have:For 3 repetitions, 4 three digit numbers.For 2 repetitions, 36 three digit numbers.So we have a total of 64 three digit numbers if repetition of digits is allowed.
-123456787
There are 10 to the 10th power possibilities of ISBN numbers if d represents a digit from 0 to 9 and repetition of digits are allowed. That means there are 10,000,000,000 ISBN numbers possible.
10^7 if the repetition of digits is allowed. 9*8*7*6*5*4*3 , if the repetition of digits is not allowed.
125
290