The total number of 9-digits numbers of different digits is ?
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Answered by
35
The number is to be of 9 digit,the first place can be filled in 9 ways only as (0 cannot be in the left)
Having filled up the first place the remaining 8 place can be filled by the remaining 9 digits in.
The no of ways is 9.9.8.7.6.5.4.3.2=9×9!
Having filled up the first place the remaining 8 place can be filled by the remaining 9 digits in.
The no of ways is 9.9.8.7.6.5.4.3.2=9×9!
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3
Answer:
counting from 1 to 9 including 0 we have 10 numbersas first place cannot be filled with 0 we will be left with 9 numbers 9 ways
and 0 to 10 one number is completed so we have again 9 factorial ways
Total =9 into 9 factorial
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