Let R be a nonempty relation on a collection of sets defined by ARB if and only if A ∩ B = Ø
Then (pick the TRUE statement)
A.  R is relexive and transitive 
B.  R is symmetric and not transitive 
C.  R is an equivalence relation 
D.  R is not relexive and not symmetric 
Option: B Explanation : Click on Discuss to view users comments. 
The binary relation S = Φ (empty set) on set A = {1, 2,3} is
A.  neither reflexive nor symmetric 
B.  symmetric and relexive 
C.  transitive and relexive 
D.  transitive and symmetric 
Option: D Explanation : Click on Discuss to view users comments. 
Which of the following sets are null sets ?
A.  {0} 
B.  ø 
C.  { } 
D.  Both (b) & (c) 
Option: D Explanation : Click on Discuss to view users comments. 
Number of subsets of a set of order three is
A.  3 
B.  6 
C.  8 
D.  9 
Option: C Explanation : Click on Discuss to view users comments. Navdeep kaur said: (7:29pm on Thursday 27th April 2017)
Why number of subsets of a set of order three is 8 ?
Kalyani mishra said: (5:16pm on Wednesday 14th February 2018)
Since no of subsets means power set ..If A ={1,2,3} then P(A) =2 ^3=8
