1
NDA Mathematics 4 September 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
If n > 7, then what is the probability that C(n, 7) is a multiple of 7?
A
0
B
$\frac{1}{7}$
C
$\frac{1}{2}$
D
1
2
NDA Mathematics 4 September 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
Two numbers x and y are chosen at random from a set of the first 10 natural numbers. What is the probability that (x + y) is divisible by 4 ?
A
$\frac{1}{5}$
B
$\frac{2}{9}$
C
$\frac{8}{45}$
D
$\frac{7}{45}$
3
NDA Mathematics 4 September 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
A number x is chosen at random from first n natural numbers. What is the probability that the number chosen satisfies x + $\frac{1}{\text{x}}$ > 2 ?
A
$\frac{1}{\text{n}}$
B
$\frac{1}{(2\text{n})}$
C
$\frac{(\text{n}−1)}{\text{n}}$
D
1
4
NDA Mathematics 4 September 2022
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
Three fair dice are tossed once. What is the probability that they show different numbers that are in AP?
A
$\frac{1}{12}$
B
$\frac{1}{18}$
C
$\frac{1}{36}$
D
$\frac{1}{72}$
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12