5/7 = 0.714285714285......so on (after 5 it repeat itself)
7/9 = 0.7177777777.......so on (after 7 it repeat itself)
note: ( in irrational number there in no repeating block of number, there was non terminating and non repeating number)
The irrational number can be:-
(1) 0.7272272227222...........
(2) 0.747447444...........
(3) 0.7676667666........ ( any number between 0.71 and 0.71)