If s = {x : x2 + 1 = 0 , x is real } then S is :
0
{ 0 }
{ Φ }
Φ
If A and B are any two sets, then A U B = ______.
X and Y are two sets such that X has 20 elements, X∪Y has 40 elements.How many elements does Y have ?
10
40
20
30
If a set A contains 3 elemetns and another set B contains 6 elements, then the number of elements in AUB would be :
9
Either 8 or 9
Either 7 or 8 or 9
Either 6 or 7 or 8 or 9.
A set having no elements is called __________
Singleton
Empty
Finite
None
If A is the set of the divisors of he number 15, B is the set of prime number s smaller than 10 and C is the set of even number s smaller than 9, then (AUC) B is the set:
{1,3,5 }
{1,2,3 }
{2,3,5 }
{2,5 }
( A ∩ B )c ∩ A is equal to _______.
B
A∩B
AUB
A - B
Which of the following is the union of the closed sets. [ 2 +1/n, 10 - 1/n], n = 1,2, - - - - - ?
[2,10]
(2, 10)
[2,10)
( 2,10]
If E is the universal set and A = BUC; then the set is the same as the set.
Bc U Cc
BUC
Bc∩Cc
B∩C
Out of 40 children 30 can swim, 27 can play chess and only 5 can do neither. How many children can swim only ?
22
12
8
