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1
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is the sum of the series 0.3 + 0.33 + 0.333 + ..... n terms?
A
$${1 \over 3}\left[ {n - {1 \over 9}\left( {1 - {1 \over {{{10}^n}}}} \right)} \right]$$
B
$${1 \over 3}\left[ {n - {2 \over 9}\left( {1 - {1 \over {{{10}^n}}}} \right)} \right]$$
C
$${1 \over 3}\left[ {n - {1 \over 3}\left( {1 - {1 \over {{{10}^n}}}} \right)} \right]$$
D
$${1 \over 3}\left[ {n - {1 \over 9}\left( {1 + {1 \over {{{10}^n}}}} \right)} \right]$$
2
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If the sum of m terms of an AP is n and the sum of n terms is m, then the sum of (m + n) terms is
A
mn
B
m + n
C
2(m + n)
D
$$-$$(m + n)
3
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
The fifth term of an AP of n terms, whose sum is n2 $$-$$ 2n, is
A
5
B
7
C
8
D
15
4
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
The sum of all the two-digit odd numbers is
A
2475
B
2530
C
4905
D
5049
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