1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Three digits are chosen at random from 1, 2, 3, 4, 5, 6, 7, 8 and 9 without repeating any digit. What is the probability that the product is odd?
A
$${2 \over 3}$$
B
$${7 \over {48}}$$
C
$${5 \over {42}}$$
D
$${5 \over {108}}$$
2
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Two events A and B are such that P (not B) = 0.8, P (A $$\cup$$ B) = 0.5 and P (A / B) = 0.4. Then, P(A) is equal to
A
0.28
B
0.32
C
0.38
D
None of these
3
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If mean and variance of a binomial variate X are 2 and 1 respectively, then the probability that X takes a value greater than 1, is
A
$${2 \over 3}$$
B
$${4 \over 5}$$
C
$${7 \over 8}$$
D
$${11 \over 16}$$
4
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Seven unbiased coins are tossed 128 times. In how many throws would you find at least three heads?
A
99
B
102
C
103
D
104
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