If repetition of digits isn't allowed, then no13-digit sequences
can be formed from only 5 digits.
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.
Assuming 9 numbers chosen from 56, with no repetition allowed, there are 7575968400 possible combinations.
If repetition is allowed . . . . . 343 If repetition is not allowed . . . . . 210
64 if repetition is allowed.24 if repetition is not allowed.
There are 2000 such numbers.
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.
290
if the repetition is allowed the there is 6*6*6 possible ways = 216
Assuming 9 numbers chosen from 56, with no repetition allowed, there are 7575968400 possible combinations.
If repetition is allowed . . . . . 343 If repetition is not allowed . . . . . 210
-4
There are 2000 such numbers.
64 if repetition is allowed.24 if repetition is not allowed.
There are 2000 such numbers.
When the repetition is allowed: 4*4*4 = 64 numbers. Without repetition: 4*3*2 = 24 numbers.
If repetition of digits is allowed, then 56 can.If repetition of digits is not allowed, then only 18 can.
There are 504 of them.