Practice Questions on Probability
Aptitude Questions and Answers

Q1.

A number X is chosen at random from the numbers -3, -2, -1, 0, 1, 2, 3. What is the probability that $|X| < 2$

A.

5/7

B.

3/7

C.

3/5

D.

1/3

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Q2.

Two brother $X$ and $Y$ appeared for an exam. Let $A$ be the event that $X$ is selected and $B$ is the event that $Y$ is selected.

The probability of $A$ is $\dfrac{1}{7}$ and that of $B$ is $\dfrac{2}{9}$. Find the probability that both of them are selected.

A.

1/63

B.

2/35

C.

2/63

D.

9/14

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Q3.

An urn contains 6 red, 5 blue and 2 green marbles. If 2 marbles are picked at random, what is the probability that both are red?

A.

6/13

B.

5/26

C.

5/13

D.

7/26

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Q4.

Four dice are thrown simultaneously. Find the probability that all of them show the same face.

A.

1/216

B.

1/36

C.

4/216

D.

3/216

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Q5.

A bag contains 12 white and 18 black balls. Two balls are drawn in succession without replacement.

What is the probability that first is white and second is black?

A.

18/145

B.

18/29

C.

36/135

D.

36/145

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