Let D_{30} = {1, 2, 3, 4, 5, 6, 10, 15, 30} and relation I be partial ordering on D_{30}. The all lower bounds of 10 and 15 respectively are
A.  1,3 
B.  1,5 
C.  1,3,5 
D.  None of these 
Option: B Explanation : Click on Discuss to view users comments. Vinodh Routhu said: (5:20am on Monday 25th August 2014)
lower bounds are 1,5 because remaining all are upper bounds

Hasse diagrams are drawn for
A.  partially ordered sets 
B.  lattices 
C.  boolean Algebra 
D.  none of these 
Option: D Explanation : Click on Discuss to view users comments. 
A selfcomplemented, distributive lattice is called
A.  Boolean algebra 
B.  Modular lattice 
C.  Complete lattice 
D.  Self dual lattice 
Option: A Explanation : Click on Discuss to view users comments. 