Question

How many 9- digit numbers can be made from 1-9 without repetition , and what are those numbers ? ​

Answer 1

987654321

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Answer 2

Answer:

It must start with a digit from {1… 9}. There are 8 possibilities and 7 possibilities, respectively, for the remaining 2 digits: 9*9*8*7 = 4536 possible numbers.

Step-by-step explanation:

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