If A = { x: x = 4n +1, 2 ≤ n ≤ 5 }, then number of subsets of A is ________.
16
15
4
None of these
n ( AUB ) is equal to ______.
n ( A) + n (B)
n ( A ) + n (B) - 2n (A∩B)
n(A) + n (B) - n (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]
Out of 40 children 30 can swim, 27 can play chess and only 5 can do neither. How many children can swim only ?
30
22
12
8
These are 600 students in a school. If 400 of them can speak Telugu, 300 can speak Hindu, then the number of students when can speak both Telugu and Hindi is _______.
100
200
300
400
If A and B are any two sets, then A ∩ B = ______.
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.
Which of the following is a null set ?
If n ( A ) = 8, n ( A ∩ B ) = 2, then n ( A - B) is equal to ________.
2
6
