1
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
2
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
3
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
4
NDA 2018 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If an infinite GP has the first term x and the sum 5, then which one of the following is correct?
A
x < $$-$$10
B
$$-$$10 < x < 0
C
0 < x < 10
D
x > 10
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