y numbers are there between 100 and 1000 in which all the digits are d

1.	y numbers are there between 100 and 1000 in which all the digits are distinet
Answer» 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 998= 648.

y numbers are there between 100 and 1000 in which all the digits are distinet

Answer»

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.