0 0 votes A system where commutativity is considered different, in how many ways the join of n relations r1,r2, . . . ,rn can be taken? Databases databases joins general-doubt + – Shukrayani 734 views answer comment Share Follow Print See all 2 Comments 2 2 Comments reply Soumya Tiwari commented Oct 30, 2018 reply Follow flag n! What's the answer given 0 0 replyShare Utkarsh Joshi commented Oct 30, 2018 reply Follow flag hmm, getting n! 0 0 replyShare Please log in or register to add a comment.
0 0 votes take n=2 only possible is 1*2 and 2*1 total=2 take n=3 1*2*3, 1*3*2 , 2*1*3 , 2*3*1 , 3*1*2 , 3*2*1 total=6 similarly take n=4 ans will be 24 hence n! is the result Cyberspam answered Oct 30, 2018 Cyberspam comment Share Follow 0 reply Please log in or register to add a comment.
