1
NDA Mathematics 3 September 2023
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

A, B, C and D are mutually exclusive and exhaustive events.

If 2P(A) = 3P(B) = 4P(C) = 5P(D), then what is 77P(A) equal to ?

A
12
B
15
C
20
D
30
2
NDA Mathematics 3 September 2023
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
Two distinct natural numbers from 1 to 9 are picked at random. What is the probability that their product has 1 in its unit place?
A
$\frac{1}{81}$
B
$\frac{1}{72}$
C
$\frac{1}{18}$
D
$\frac{1}{36}$
3
NDA Mathematics 3 September 2023
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
Two dice are thrown. What is the probability that difference of numbers on them is 2 or 3 ?
A
$\frac{7}{36}$
B
$\frac{7}{18}$
C
$\frac{5}{18}$
D
$\frac{11}{36}$
4
NDA Mathematics 3 September 2023
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
What is the mean of the numbers 1, 2, 3, ... 10 with frequencies 9C09C19C2 ..., 9C9, respectively?
A
1.1 × 28
B
1.2 × 74
C
5.5
D
0.55
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