how many numbers are there between 100and1000 in which all the digits are distinct
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900 numbers are there between 100 and 1000
aryan289:
but ans is 648 this que is of permutation ch of class 11
sorry,1st place can be filled by 9 digits- 1–9 excluding zero as 0 on first place would not form a 3 digit no.
2nd place can be filled by 9 digits- 0–9 not including the 1st no.
3rd place can be filled by 8 digits- 0–9 not including he 1st 2 nos.
Therefore answer is 9*9*8= 648
2nd place can be filled by 9 digits- 0–9 not including the 1st no.
3rd place can be filled by 8 digits- 0–9 not including he 1st 2 nos.
Therefore answer is 9*9*8= 648
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Answer:there are 648 numbers
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