Re: How many natural numbers less than 10^8 are there, whose sum of digits equals 7?

Posted by Bankelal on Dec 03, 2013; 4:16am
URL: http://discussion-forum.276.s1.nabble.com/How-many-natural-numbers-less-than-10-8-are-there-whose-sum-of-digits-equals-7-tp7584287p7584294.html

Quant book for CAT by Arun Sharma will serve better for combinatorics and probability, since it helps to develop the intuitive approach to such problems.

Will definitely help you for IGDIR, but don't expect much for ISI. 

On Tue, Dec 3, 2013 at 8:48 AM, XIPP [via Discussion forum] <[hidden email]> wrote:

Many many thanks, Aditya. Will you please let me know where did you learn this technique? Also, will you recommend some book for combinatorics?

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