Quantitative Aptitude

Quantitative Aptitude Quiz: Probability

Ajay Singh
Mar 9, 2021
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It is crucial to have a good command over the Quantitative Aptitude section to score high in competitive exams and make it to the final merit list. With frequent quizzes based on different topics from the Quantitative Aptitude section, Exammr has come to your rescue in improving your mathematical skills with the passage of each day.

Q1. A military man can strike a target once in 3 bullets. If he fires 3 bullets in succession, what is the probability that he will strike his target?

a) 1/3
b) 19/27
c) 2/3
d) 8/27
e) None of these

Q2. Three dice are thrown together. Find the probability of getting a total of at least 6?

a) 103/216
b) 103/208
c) 103/108
d) 36/103
e) None of these

Q3. A number is selected at random from first 40 natural numbers. What is the chance that it is a multiple of either 4 or 14?

a) 1/5
b) 11/40
c) 3/10
d) 10/40
e) None of these

Q4. In a bag, there are 4 white, 4 red and 2 green balls. Two balls are drawn at random. What is the probability that at least one ball is of green colour?

a) 4/5
b) 3/5
c) 1/5
d) 2/5
e) None of these

Q5. An urn contains 9 blue, 5 white and 7 black balls. If 2 balls are drawn at random, what is the probability that only one ball is white?

a) 3/10
b) 7/22
c) 8/21
d) 11/21
e) 16/21

Q6. here are 7 red balls and 8 yellow balls in a bag. Two balls are simultaneously drawn at random. What is the probability that both the balls are of the same colour?

a) 3/18
b) 13/30
c) 3/10
d) 7/18
e) 7/15

Q7. A boss decides to distribute Rs. 2000 between 2 employees. He knows X deserves more that Y, but does not know how much more. So he decides to arbitrarily break Rs. 2000 into two parts and give X the bigger part. What is the chance that X gets twice as much as Y or more?

a) 2/3
b) 1/5
c) 1/3
d) 2/5
e) None of the above

Q8. A book-shelf contains 2 English, 3 Hindi and 4 Sanskrit books. If two books are picked at random, then what is the probability that either all are Sanskrit or all are English books?

a) 12/36
b) 7/36
c) 15/36
d) 11/36
e) None of these

Q9. In a college, 35% of the students speak English, 55% speak Hindi and 14(2/7)% speak both the languages. If a student is selected at random for a competition, what is the probability that he/she can speak English or Hindi?

a) 1/7
b) 1/6
c) 63/70
d) 53/70
e) None of these

Q10. In a class test of 50 students, 20 are boys and 30 are girls. 10 boys and 15 girls ranked in A grade. If a student is chosen at random from the class, what is the probability of choosing a girl or an A grade student?

a) 2/5
b) 3/5
c) 8/5
d) 4/5
e) None of these

Answers:
b) 19/27
c) 103/108
b) 11/40
d) 2/5
c) 8/21
e) 7/15
a) 2/3
b) 7/36
d) 53/70
d) 4/5

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