1
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If $$n = (2017)!$$, then what is $${1 \over {{{\log }_2}n}} + {1 \over {{{\log }_3}n}} + {1 \over {{{\log }_4}n}} + ... + {1 \over {{{\log }_{2017}}n}}$$ equal to?
A
0
B
1
C
$${n \over 2}$$
D
n
2
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If $$x + {\log _{15}}(1 + {3^x}) = x{\log _{15}}5 + {\log _{15}}12$$, where x is an integer, then what is x equal to?
A
$$-$$ 3
B
2
C
1
D
3
3
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If 0 < a < 1, the value of log10 a is negative. This is justified by
A
Negative power of 10 is less than 1
B
Negative power of 10 is between 0 and 1
C
Negative power of 10 is positive
D
Negative power of 10 is negative
4
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If $${x^{{{\log }_7}x}} > 7$$ where x > 0, then which one of the following is correct?
A
$$x \in (0,\infty )$$
B
$$x \in \left( {{1 \over 7},7} \right)$$
C
$$x \in \left( {0,{1 \over 7}} \right) \cup (7,\infty )$$
D
$$x \in \left( {{1 \over 7},\infty } \right)$$
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