1
NDA 2016 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is the number of natural numbers less than or equal to 1000 which are neither divisible by 10 nor 15 nor 25?
A
860
B
854
C
840
D
824
2
NDA 2016 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Suppose, there is a relation * between the positive numbers x and y given by x * y if and only if x $$\le$$ y2. Then, which one of the following is correct?
A
* is reflexive but not transitive and symmetric
B
* is transitive but not reflexive and symmetric
C
* is symmetric and reflexive but not transitive
D
* is symmetric but not reflexive and transitive
3
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
4
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
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