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Q: Where d represents a digit from 0 9 how many different ISBN numbers are possible if repetition of digits is allowed?

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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 5Â³ = 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

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