Answer :

2/3= 6/9= 12/18= 18/27 and 4/9=12/27 now 5 rational no between 12/27 and 18/27 are 13/27,14/27,15/27,16/27,17/27
5/9,6/9,18/27,16/27,15/27 are the 5 rational numbers between 2/3 and 4/9

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