Probability : Aptitude Questions and Answers

Probability questions and answers are most important for all competitive exams and entrance tests. In this section, you will find many types of probability questions and answers. Practice these questions and answers that will help you crack any competitive exam like SSC, IBPS, PO, RBI, PSC, RAIL, PSU, and many more exams. Now, all competitive exams are online so here you can practice free online exams in our online test section. We are providing many exams probability questions with solutions regularly. Check out this page regularly to get updated probability questions and answers. Here you will find many other subjects general aptitude questions and answers.

Probability Questions and Answers


Q1. A box contains 5 green, 4 yellow and 3 white marbles. Three marbles are drawn at random. What is the probability that they are not of the same colour ?

A. 3/44

B. 52/55

C. 41/44

D. 3/55

SHOW ANSWER
Correct Answer : 41/44


Q2. What is the probability of getting a sum 9 from two throws of a dice ?

A. 1/6

B. 1/9

C. 1/8

D. 1/12

SHOW ANSWER
Correct Answer : 1/9


Q3. Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even ?

A. 1/2

B. 3/8

C. 5/16

D. 3/4

SHOW ANSWER
Correct Answer : 3/4


Q4. A speaks truth in 75% cases and B in 80% of the cases. In what percentage of cases are they likely to contradict each other, narrating the same incident ?

A. 35%

B. 15%

C. 5%

D. 45%

SHOW ANSWER
Correct Answer : 35%


Q5. From a pack of 52 cards, two cards are drawn together at random. What is the probability of both the cards being kings ?

A. 1/15

B. 25/57

C. 1/221

D. 35/256

SHOW ANSWER
Correct Answer : 1/221


Q6. Two cards are drawn together from a pack of 52 cards. The probability that one is a spade and one is a heart, is :

A. 13/102

B. 3/20

C. 29/34

D. 47/100

SHOW ANSWER
Correct Answer : 13/102


Q7. In a class, there are 15 boys and 10 girls. Three students are selected at random. The probability that 1 girl and 2 boys are selected, is :

A. 3/25

B. 1/50

C. 21/46

D. 25/117

SHOW ANSWER
Correct Answer : 21/46


Q8. A bag contains 4 white, 5 red and 6 blue balls. Three balls are drawn at random from the bag. The probability that all of them are red, is :

A. 3/22

B. 2/91

C. 2/77

D. 1/22

SHOW ANSWER
Correct Answer : 2/91


Q9. A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue ?

A. 2/7

B. 5/7

C. 10/21

D. 10/21

SHOW ANSWER
Correct Answer : 10/21


Q10. In a box, there are 8 red, 7 blue and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green ?

A. 2/3

B. 3/4

C. 8/21

D. 7/19

SHOW ANSWER
Correct Answer : 8/21


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