1
NDA Mathematics 16 April 2023
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
In an AP, the first term is x and the sum of the first n terms is zero. What is the sum of next m terms ?
A
$\frac{m x(m+n)}{n-1}$
B
$\frac{m x(m+n)}{1-n}$
C
$\frac{n x(m+n)}{m-1}$
D
$\frac{n x(m+n)}{1-m}$
2
NDA Mathematics 16 April 2023
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
p, q, r and s are in AP such that p + s = 8 and qr = 15. What is the difference between largest and smallest numbers ?  
A
6
B
5
C
4
D
3
3
NDA Mathematics 16 April 2023
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If G is the geometric mean of numbers 1, 2, 22, 23,.....2n-1, then what is the value of 1 + 2log2G ?
A
1
B
4
C
n - 1
D
n
4
NDA Mathematics 16 April 2023
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If H is the harmonic mean of numbers 1, 2, 22, 23, ......2n-1 what is n/H equal to ? 
A
$2-\frac{1}{2^{n+1}}$
B
$2-\frac{1}{2^{n-1}}$
C
$2+\frac{1}{2^{n-1}}$
D
$2-\frac{1}{2^{n}}$
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