1
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If the roots of the equation 4x2 - (5k + 1)x + 5k = 0 differ by unity, then which one of the following is a possible value of k?
A
-3
B
-1
C
$-\frac{1}{5}$
D
$-\frac{3}{5}$
2
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
Consider the digits 3, 5, 7, 9. What is the number of 5-digit numbers formed by these digits in which each of these four digits appears?
A
240
B
180
C
120
D
60
3
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
How many distinct matrices exist with all four entries taken from (1, 2)?
A
16
B
24
C
32
D
48
4
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If i = √-1, then how many values does i-2n have for different n ∈ ℤ?
A
One 
B
Two
C
Four
D
Infinite
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