#!/bin/bash
read a b
while [ $a -gt "0" -a $b -gt "0" ]
do
a1=0
c=1
c1=1
while [ "$a1" -le $b ] 
do 
c1=`echo "($c1 * $a)" |bc`
a1=`echo "$a1+1"|bc`
done
echo "$c1/$a" |bc|sed -e ':a;N;$!ba;s/\n//g'|sed -e 's/\\//g'
read a b
done