want to know good courses on discrete mathematics on coursera or udacity or nptel and also suggest a good book as it is also very necessary
Hello,
I agree with you and a good book on Discrete Maths that is also freely available online is:
“Mathematics for Computer Science
Eric Lehman and Tom Leighton
2004”
It covers several DM topics which are useful in programming contests 
I would also highly recommend you to check the “Get Started” link from Codechef to Schools initiative in case you haven’t done so, as it is really, really good, an absolute must read and consult 
Best regards,
Bruno
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and about lectures on coursera or udacity
Hello again,
As this might be a somewhat long list I decided to write a second answer instead of comment.
On Udacity there are several courses:
Introduction to Computer Science
Maths applied to Computer Science
On Coursera there are some too:
Design and Analysis of Algorithms
Hope this helps,
Bruno
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Concrete Mathematics by Donald Knuth.
tried to read knuth but no use
actually bro on udacity the course is not systematically organised so any other options if available
@surajkvm007 : Read , Discrete Mathematics , by C.L. Liu , by Tata Mc Graw Hill Publishers . Its not free but very affordable .
pls any more help or any more suggestions
help me with a book available online