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Give two rational numbers lying between $0.515115111511115…$ and $0.5353353335…$
Given:
Given numbers are $0.515115111511115…$ and $0.5353353335…$.
To do:
We have to find two rational numbers lying between $0.515115111511115…$ and $0.5353353335…$
Solution:  
A rational number can be expressed in either terminating decimal or non-terminating recurring decimals and an irrational number is expressed in non-terminating non-recurring decimals.
This implies,
$0.515115111511115…$ and $0.5353353335…$ are irrational numbers.
We can insert infinite rational numbers between two irrational numbers.
Therefore,
$0.516$ and $0.517$ are greater than $0.515115111511115…$ and less than $0.5353353335…$
Therefore, two rational numbers lying between $0.515115111511115…$ and $0.5353353335…$ are $0.516$ and $0.517$. 
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