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Using the digits 12345678 and 9 without repeating any of the digits you can make 86 numbers. The number combinations are as follows:12 13 14 15 16 17 18 19, 21 23 24 25 26 27 28 29, 31 32 34 35 36 37 38 39,41 42 43 45 46 47 48 49, 51 52 53 54 56 57 58 59,61 62 63 64 65 67 68 69, 71 72 73 74 75 76 78 79,81 82 83 84 85 86 87 89,91 92 93 94 95 96 97 98

Q: How many 2 digit numbers can be produced using the digits 12345678 and 9 if the repetition of the digits is not allowed?

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With repetition, there are 86 ( = 262144) such numbers. Without repetition, there are still 8!/2! = 20160.

if the repetition is allowed the there is 6*6*6 possible ways = 216

20 of them, if repetition is not allowed.

They are 12345678 and 9.

There are 2000 such numbers.

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With repetition, there are 86 ( = 262144) such numbers. Without repetition, there are still 8!/2! = 20160.

If repetition is allowed . . . . . 343 If repetition is not allowed . . . . . 210

64 if repetition is allowed.24 if repetition is not allowed.

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.

12345678

There are 5*5*5 = 125 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.

if the repetition is allowed the there is 6*6*6 possible ways = 216

-123456787

Assuming 9 numbers chosen from 56, with no repetition allowed, there are 7575968400 possible combinations.