## Matt71 3 years ago How many times does the digit 1 appear in the number 500, solution please

1. moneybird

0

2. bob06

none

3. Matt71

Nonononono, I mean 1,2,3,4,5....500

4. Ishaan94

lol

5. Sriram

19*5+100

6. bob06

oooooooooo 1,11,12,13,14,15,16,17,18,19,21,31,41,51,61,71,81,91,101,111,112,113,114,115,116,117,118,119,121,131,141,151,161,171,181,191...........

7. myininaya

i don't get it

8. Sriram

19*5+100=195

9. agdgdgdgwngo

@sriram how did you work that out?

10. Ishaan94

Yeah How did you work that out so fast

11. myininaya

i don't understand the question there is no digit 1 in 500 500 has the digits 5, 0 (multiplicity 2)

12. sandra

the question is the numbers 1-500

13. Ishaan94

ihe meant 1 to 500 @myininaya

14. agdgdgdgwngo

@myininaya He meant in the range 1,2,...,500

15. myininaya

ok

16. bob06

200 times right?

17. pokemon23

bob96 can you help me in math?

18. Matt71

bob06, solution?

19. bob06
20. bob06

@pokemon sure but make it fast ;)

21. Sriram

look from 1 to 100 10 digits end wid 1 (,1,11,21,31...91 n 10 srart wid 1 (10,11,12...19) hence 20 1,s from 1to 99 same for 200 to 299 and 300 to 399 & 400 to 500 bt100 to 199 20 ones wid 100 ones in hundreds place hence 20*5 +100=200 previous ans wrong

22. Matt71

good answer, but you got a solution without using computers?

23. agdgdgdgwngo

I've got a solution using computers :-D There's also an analytical solution without computers.

24. Sriram

yep

25. agdgdgdgwngo

Sriram is right

26. Matt71

Well, got my answer thanks to all