1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
A coin is tossed five times. What is the probability that heads are observed more than three times ?
A
$${3 \over {16}}$$
B
$${5 \over {16}}$$
C
$${1 \over {2}}$$
D
$${3 \over {32}}$$
2
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
An unbiased coin is tossed until the first head appears or until four tosses are completed, whichever happens earlier. Which of the following statement(s) is/are correct?

1. The probability that no head is observed is $${1 \over {16}}$$.

2. The probability that the experiment ends with three tosses is $${1 \over {8}}$$.

Select the correct answer using the code given below.
A
Only 1
B
Only 2
C
Both 1 and 2
D
Neither 1 nor 2
3
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If x$$\in$$[0, 5], then what is the probability that x2 $$-$$ 3x + 2 $$\ge$$ 0 ?
A
$${4 \over 5}$$
B
$${1 \over 5}$$
C
$${2 \over 5}$$
D
$${3 \over 5}$$
4
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
A bag contains 4 white and 2 black balls and another bag contains 3 white and 5 black balls. If one ball is drawn from each bag, then the probability that one ball is white and one ball is black, is
A
$${5 \over {24}}$$
B
$${13 \over {24}}$$
C
$${1 \over {4}}$$
D
$${2 \over {3}}$$
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