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126. The symmetric difference of sets A and B is
(A - B) ∪ (B - A)
(A ∪ B) - (A ∩ B)
(A - B) ∩ (B - A)
(A ∩ B) - (A ∪ B)
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127. In a classroom containing 28 people, there are 18 people who speak English, 15 people who speak Hindi and 22 people who speak Telugu, 9 people speak both English and Hindi, while 1 people speak both Hindi and Telugu. Further 13 persons speak both Telugu and English. How many people speak all three languages?
9
8
7
6
128. If [x] denotes integer part of the real number, then the function f(x) = x - [x] is/an
even function
odd function
periodic function
constant
129. If x, y are real numbers such that ordered pairs (x + y, x -y) and (2x + 3y, 3x - 2y) are equal, then (x, y) is equal to
(1, 1)
(2, 3)
(3, - 2)
(0, 0)
130. If Q be the set of non-zero rational numbers and the relation R be defined over the set Q by xRy if x = 1/y, x, y ∈ Q, then
R is an equivalence relation
R is reflexive
R is symmetric
R is transitive
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