Question

0.001(1 bar) Express it in p by q form

Answer 1

let x=0.001 bar=0.001001001.......
and 1000 x = 1.001001001.............
subtract x from 1000 x 1000 x = 1.001001001.........-     
 x = 0.001001001......... 
999 x = 1.000000000.......... 
999 x = 1     
x  =   1/999

Answer 2

x=0.001 bar
1000x=1.001001001.....
1000x-x=1.001001.....- 0.001001001.....
999x=1
x=1/999