Re: jnu 2010

Posted by Akshay Jain on May 13, 2014; 6:12pm
URL: http://discussion-forum.276.s1.nabble.com/jnu-2010-tp7589613p7589618.html

There is only 1 way in which a student can answer all the questions correctly
so no. Of ways in wich a student fail to get all the answers is the same as the no of ways in which he attempts atleat 1 ques  incorrectly
so this is equal to total no. Of ways - 1(way in which all answers are correct)
= 4^3-1