1
NDA 2016 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Let R be a relation on the set N of natural numbers defined by 'nRm $$\Leftrightarrow$$ n is a factor of m'. Then, which one of the following is correct?
A
R is reflexive, symmetric but not transitive.
B
R is transitive, symmetric but not reflexive
C
R is reflexive, transitive but not symmetric
D
R is an equivalence relation
2
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If E is the universal set and A = B $$\cup$$ C, then the set E $$-$$ (E $$-$$ (E $$-$$ (E $$-$$ (E $$-$$A)))) is same as the set
A
B' $$\cup$$ C'
B
B $$\cup$$ C
C
B' $$\cap$$ C'
D
B $$\cap$$ C
3
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If A = {x : x is a multiple of 2}, B = {x : x is a multiple of 5} and C = {x : x is a multiple of 10}, then A $$\cap$$ (B $$\cap$$ C) is equal to
A
A
B
B
C
C
D
{x : x is a multiple of 100}
4
NDA 2017 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If we define a relation R on the set N $$\times$$ N as (a, b) R (c, d) $$ \Leftrightarrow $$ a + d = b + c for all (a, b), (c, d) $$\in$$N $$\times$$ N, then the relation is
A
symmetric only
B
symmetric and transitive only
C
equivalence relation
D
reflexive only
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