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: (10:20pm on Sunday 24th 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. bhanu said: (6:08pm on Wednesday 27th September 2017)
answer is 'A' because hasse diagram is made for partially ordered sets according to google.

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. 