1
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)
2
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
3
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
4
NDA 2017 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
The sum of the first n terms of the series $${1 \over 2} + {3 \over 4} + {7 \over 8} + {{15} \over {16}} + ....$$ is equal to
A
2n $$-$$ n $$-$$ 1
B
1 $$-$$ 2$$-$$n
C
2$$-$$n + n $$-$$ 1
D
2n $$-$$ 1
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