1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If p, q, r are in one geometric progression and a, b, c are in another geometric progression, then ap, bq, cr are in
A
AP
B
GP
C
HP
D
None of these
2
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What is the sum of n terms of the series $$\sqrt 2 + \sqrt 8 + \sqrt {18} + \sqrt {32} + ...$$?
A
$${{n(n - 1)} \over {\sqrt 2 }}$$
B
$$\sqrt 2 n(n + 1)$$
C
$${{n(n + 1)} \over {\sqrt 2 }}$$
D
$${{n(n - 1)} \over 2}$$
3
NDA 2016 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What is the greatest value of the positive integer n satisfying the condition?

$$1 + {1 \over 2} + {1 \over 4} + {1 \over 8} + .... + {1 \over {{2^{n - 1}}}} < 2 - {1 \over {1000}}$$
A
8
B
9
C
10
D
11
4
NDA 2016 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
How many geometric progressions is/are possible containing 27, 8 and 12 as three of its/their terms?
A
One
B
Two
C
Four
D
Infinitely many
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