1
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
A committee of three has to be chosen from a group of 4 men and 5 women. If the selection is made at random, what is the probability that exactly two members are men?
A
$${5 \over {14}}$$
B
$${1 \over {21}}$$
C
$${3 \over {14}}$$
D
$${8 \over {21}}$$
2
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
A bag contains 20 books out of which 5 are defective. If 3 of the books are selected at random and removed from the bag in succession without replacement, then what is the probability that all three books are defective?
A
0.009
B
0.016
C
0.026
D
0.047
3
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
A coin is biased so that heads comes up thrice as likely as tails. For three independent tosses of a coin, what is the probability of getting at most two tails?
A
0.16
B
0.48
C
0.58
D
0.98
4
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If a coin is tossed till the first head appears, then what will be the sample space?
A
{H}
B
{TH}
C
{T, HT, HHT, HHHT, ...........}
D
{H, TH, TTH, TTTH, .............}
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