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.
64 if repetition is allowed, 6 otherwise.64 if repetition is allowed, 6 otherwise.64 if repetition is allowed, 6 otherwise.64 if repetition is allowed, 6 otherwise.
5040
If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.
1000
290
If repetition is allowed . . . . . 343 If repetition is not allowed . . . . . 210
-4
If repetition is allowed [such as 122 or 555], then there are 5³ = 125 possibilities.
64 if repetition is allowed.24 if repetition is not allowed.
5 ^12
Yes.
if the repetition is not allowed then the arrangement can be 3*2*1 = 6 ways if repetition is allowed the ways can be 6*6*6= 216 ways