4 votes 4 votes Set Theory & Algebra set-theory relations + – monali asked Sep 16, 2015 retagged Dec 19, 2015 by Arjun monali 3.7k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
Best answer 8 votes 8 votes u can ans this by using concept of Bell no 1 1 2 2 3 5 5 7 10 15 and so on for n=4 check 4th row ans will be 15 Pooja Palod answered Sep 16, 2015 selected Nov 30, 2015 by Akash Kanase Pooja Palod comment Share Follow See 1 comment See all 1 1 comment reply Karan Dodwani 1 commented Jul 19, 2018 reply Follow Share Let Set A={1,2,3,4,5} R={ (1,1) (2,2) (3,3) (4,4) (5,5) (1,2) (2,1) (4,5) (5,4) } In this relation i am getting 3 Partitions. Please tell some short method to identify how many partitions are possible. ? 0 votes 0 votes Please log in or register to add a comment.
5 votes 5 votes See https://en.wikipedia.org/wiki/Bell_number Happy Mittal answered Sep 16, 2015 Happy Mittal comment Share Follow See all 0 reply Please log in or register to add a comment.
5 votes 5 votes U will get from this bel number when n=4 Paras Nath answered Sep 19, 2016 Paras Nath comment Share Follow See all 0 reply Please log in or register to add a comment.