For any two sets A and B, then A ∩ ( AUB)' =
Φ
A
B
A'
If f(x) = x2 - x then f(x - 1) - f(x + 1) is
4x
4x + 2
2 - 4x
4x - 2
In a survey, 30 people use tooth paste A, 25 use toothpaste B and 5 use both. Then the total number of people is
45
50
55
40
If {(-3, a)(4, 5)} represents a constant function then the value of a is
5
-3
4
3
If f(x) = 2x - 3 g(x) = x + 1 then fog is
2x - 2
2x + 2
2x - 1
2x + 1
(A∪B)' =
A'∪B'
A'∩B'
(A∩B)'
A'∪B
If A, B, C are three sets, then An(B∪C) is equal to
(A∪B) ∩ (A∪C)
(A∩B) ∪ (A∩C)
(A∪B) ∪ (A∪C)
none of these
If A∩B = B then
A ⊂ B
B ⊂ A
A = ∅
B = ∅
Express i (-i) in the form b or b i, where b is a real number.
i
-i
1
-1
If X and y are two sets such that n(x) = 17, n(y) = 23 and n(x∪y) = 38. Then n (x∩y) = ?
78
2