Add and take away to 20 

 - Mumbai:  Sheth Publication House,  2009 
 - un paged 
<br/><br/><label>ISBN: </label>9788175351974 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>372.7 DUN