Probability Questions For Bank Clerk Prelims : 01

1) A basket contains x white, 6 red and 4 yellow colour balls. If one ball is taken at random from the basket and the probability of getting a red colour ball is 2/5, then find the total number of balls in the basket?

A.12

B.18

C.16

D.15

E.None of these

2) Three coins are tossed. What is the probability of getting exactly two tails?

A.1/4

B.3/8

C.1/2

D.5/8

E.None of these

3) A dice is rolled, what is the probability of the outcome is a prime number?

A.1/2

B.2/3

C.5/6

D.1/3

E.None of these

4) Two cards are drawn at the random from a pack of cards. What is the probability that both are Kings?

A.3/221

B.4/221

C.5/221

D.1/221

E.None of these

5) A bag contains 3 red balls and 4 green balls. What is the probability of selecting 2 green balls from bag?

A.1/7

B.2/7

C.3/7

D.4/7

E.None of these

6) What is the probability of selecting 2 blue balls from a bag contains 4 red balls and 5 blue balls?

A.5/18

B.7/18

C.1/3

D.2/9

E.3/7

7) A bag contains 4 red balls, 3 blue balls and 6 green balls. If two balls are drawn at random, then what is the probability that either both are red or both are blue?

A.1/26

B.1/13

C.3/26

D.2/13

E.None of these

9) If the bag contains 3 apples and 4 oranges, what is the probability of choosing two oranges?

A.1/7

B.2/7

C.3/7

D.4/7

E.None of these

10) A bag contains 30 balls numbered from 1 to 30. Two balls are selected one by one with replacement at random. What is the probability that the first ball is a prime number and second ball is a perfect square?

A.1/3

B.1/6

C.1/9

D.1/18

E.1/24

Answer & Explanation