sir i had asked a book on logarithms, u refered rd sharma but there is no chapter on logarithm in it, please tel me a book on it.

Hi ,

The best book for log would be of s. l . loni..

And for more good books for IIT preparation .. check out :

http://www.askiitians.com/Important-books-iit-jee.aspx

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All the best.