ISI permutation and comb doubt

Posted by SoniaKapoor on Dec 29, 2013; 10:40am
URL: http://discussion-forum.276.s1.nabble.com/ISI-permutation-and-comb-doubt-tp7584416.html

No of ways in which 6 pencils can be distributed btw 2 boys such that each boy gets atleast 1 pencil...


How to solve such problems..