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so the irrational numbers would be

1) 0.720720072000..........

2) 0.731731173111...........

3) 0.80800800080000.........

first we have to change the the number into decimal or rational

decimal form of 5/7 is 0.71428571 and the decimal form of 9/11 is 81818181

hence the rational number are between 0.71428571 and 0.81818181

rational numbers between 5/7 and 9/11

1) 0.72428571

2)0.73428571

3)0.74428571

upto 0.80818181

you can take any number between them as irrational.