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1
NDA Mathematics 14th September 2025
MCQ (Single Correct Answer)
+2.5
-0.833
Change Language
What is the sum of the binary numbers $(10110110) _2$ and $( 10001 1) _2$
 
1
 $ (110110001)_2 $
2
$ ( 1 10001 000) _2$
3
$( 1 100001 00) _2$
4
$(100100000) _2$
2
NDA Mathematics 14th September 2025
MCQ (Single Correct Answer)
+2.5
-0.833
Change Language
What is the harmonic mean of the numbers C(10,3) C(10,4) C(10,5) C(10,6) and C(10,7) ?
1
3150/19
2
4000/19
3
252
4
225
3
NDA Mathematics 13 April 2025
MCQ (Single Correct Answer)
+2.5
-0.833
Change Language
The sum of the first k terms of a series S is . Which one of the following is correct?
A
The terms of S form an arithmetic progression with common difference 14.
B
The terms of S form an arithmetic progression with common difference 6.
C
The terms of S form a geometric progression with common ratio 10/7.
D
The terms of S form a geometric progression with common ratio 11/4.
4
NDA Mathematics 13 April 2025
MCQ (Single Correct Answer)
+2.5
-0.833
Change Language
The sum of the first 8 terms of a GP is five times the sum of its first 4 terms. If ≠ is the common ratio, then what is the number of possible real values of r?
A
One 
B
Two 
C
Three
D
More than three 
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