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1
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If a set A contains 3 elements and another set B contains 6 elements, then what is the minimum number of elements that (A $$\cup$$ B) can have?
A
3
B
6
C
8
D
9
2
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If A, B and C are subsets of a given set, then which one of the following relations is not correct?
A
A $$\cup$$ (A $$\cap$$ B) = A $$\cup$$ B
B
A $$\cap$$ (A $$\cup$$ B) = A
C
(A $$\cap$$ B) $$\cup$$ C = (A $$\cup$$ C) $$\cap$$ (B $$\cup$$ C)
D
(A $$\cup$$ B) $$\cap$$ C = (A $$\cap$$ C) $$\cup$$ (B $$\cap$$ C)
3
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Suppose X = {1, 2, 3, 4} and R is a relation on X. If R = {(1, 1), (2, 2), (3, 3), (1, 2), (2, 1), (2, 3), (3, 2)}, then which one of the following is correct?
A
R is reflexive and symmetric, but not transitive
B
R is symmetric and transitive, but not reflexive
C
R is reflexive and transitive, but not symmetric
D
R is neither reflexive nor transitive, but symmetric.
4
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
A relation R is defined on the set N of natural numbers as xRy $$\Rightarrow$$ x2 $$-$$ 4xy + 3y2 = 0. Then, which one of the following is correct?
A
R is reflexive and symmetric, but not transitive
B
R is reflexive and transitive, but not symmetric
C
R is reflexive, symmetric and transitive
D
R is reflexive, but neither symmetric not transitive
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