Math, asked by aryan289, 1 year ago

how many numbers are there between 100and1000 in which all the digits are distinct

Answers

Answered by sapna29

900 numbers are there between 100 and 1000

aryan289: but ans is 648 this que is of permutation ch of class 11

sapna29: 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

Answered by sijykt

Answer:there are 648 numbers

Step-by-step explanation:

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