how many numbers are there from 100 to 1000 in which sum of any two digit equal to the third digit..?
Answers
Answered by
0
This range gives all 3 digit nos.
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.
Similar questions