Originally posted by talzamir
How many zero's are at the end of 1 x 2 x 3 x .... x 1,000 ?
What's the non-zero number right before them?
1000 factorial. I can't even get an answer in my HP calculator, it only goes up to 500!.
I assume therefore there is a shortcut, but no idea what that would be.
My casio poops out at 69!, which is 1.7 E98, so only up to 2 digit exponent and my HP I think only has 3 digit exponents.
So the answer must be 248 zero's.