Question

\[20!=24329020081766xy000\]

Find x,y

Answer 1

x=4 and y=0

Answer 2

\[10^4/20!===>y=0\]
\[9/20!====>9/59+x \text{and 0<x<=9}===>x=4\]

Answer 3

I think you missed a zero @mukushla
which would make @Neemo 's answer correct

Answer 4

http://www.wolframalpha.com/input/?i=20!&t=crmtb01

Answer 5

4 0's at the end

and \[\frac{20!}{10^4} \equiv\ 4 (mod \ 10)\]

Answer 6

oh wait, I may have miscounted the digits... sorry

Answer 7

np :)