Given n(U) = 20, n(A) = 12, n(B) = 9 , n(A∩B) = 4 , where U is the universal set, A and B are subsets of U then
n(A∪B) =
17
9
11
3
Let A and B be two non empty subsets of a set x. Such that A is not a subset of B, then
A is always a subset of the complement of B
B is always a subset of A
A and B are always disjoint
A and the complement of B are always non - disjoint
If {(2, 7), (4, x)} represents constant function then the value of x is
2
4
7
-2
X-gene in a plant is responsible for red flowers and Y-gene for white flowers. If both are present, then the flowers produced are pink. If 20 plants have X-gene, 20 plants have Y- gene and there are 30 plants in all, then the total number of plants producing pink flowers are
13
10
20
30
The number of non - empty subsets of the set {1,2,3,4} is
15
14
16
Let A = { x: x N, 2 ≤ x ≤ 7}, ß = { x: x N, 5 ≤ x ≤ 10} Find A ∩ ß.
{5, 6, 7}
{2, 3, 4}
{8, 9, 10}
{ 3, 4, 5}
If A = {2, 3, 4}, B = {1, 3, 5, 7} U = {1, 2, 3.......8} then (A∪B)' is
{6, 8}
{1, 2, 3, 4, 6, 7}
{3}
{8}
If f:Z→Z be defined by f(x) = -x, then f is
in to function
One - one and on to function
Many to one function
Identity function
The smallest set A such that A∪{1,2} = {1,2,3,5,9} is
{2,3,5}
{3,5,9}
{1,2,5,9}
none of these
If A = {1, 2, 3} B = {3, 5, 7}, f: A → B is given by f(x) = 2x + 1, then f is
In to function
On to function
Constant function
