100 factorial
here's a new problem you might find fun. the question is: how many zeroes appear at the end of the rather large number 100!
that's 100 factorial, not yelling the number 100. :)
I recently used your site for studying for a msft interview. Although I didn't get any questions from your site that I hadn't already heard before, it did help to see so many logic problems. thanks! oh, i got the job by the way. :)
Jesse Hersch
Friday, March 22, 2002
and if you find that one too easy, why not find how many zero digits *total* are in 100!
Jesse Hersch
Friday, March 22, 2002
sorry for being redundant. i just found that this question is already on the site! oops.
http://www.techinterview.org/Puzzles/fog0000000149.html
Jesse Hersch
Friday, March 22, 2002
I think the answer to the trailing 0s problem should be 21.
for for for
10s 5s 100

10 + 10 + 1
why additional 3 ?? I couldn't understand?
because I think any even number not ending with 0 if multiplied with 5 gives some number ending with 0. If multiplied by 5 again the number of trailing 0s wont increase.
may be my whole understanding of the problem itself is wrong.
comments ...
Govind Jajoo
Friday, March 22, 2002
I take back my posting. I got it now.
thanks for ur patience.
Govind Jajoo
Friday, March 22, 2002
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