In a survey, 30 people use tooth paste A, 25 use toothpaste B and 5 use both. Then the number of people interviewed is
45
50
55
40
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)c] =
17
9
11
3
Which of the following statement is true ?
3 ⊆ {1,3,5}
3 ∈ {1,3,5}
{3} ∈ {1,3,5}
{3,5} ∈ {1,3,5}
If {(2, 7), (4, x)} represents constant function then the value of x is
2
4
7
-2
If f(x) = 2x - 3 g(x) = x + 1 then fog is
2x - 2
2x + 2
2x - 1
2x + 1
If A = [1, 2}, B = {1, 2, 3, 4} then
B is a subset of A
A is a subset of B
C and B are equal sets
None of these
B - A is defined as
{x/x∈A, x∉B}
{x/x∈B, x∉A}
{x/x∈A, x∈B}
{x/x∈B, x∈A and B}
Let U be the universal set containing 700 elements. If A and B are sub- sets of U such that n (A) = 200, n (B) = 300 and n (A ∩ B) = 100, then n ( A' ∩B')=
400
500
300
800
If R is the set of real numbers and Q is the set of rational numbers, then what is R - Q ?
Rational numbers
Irrational numbers
Real numbers
Integers
