Probability (SSC)

Total Questions: 64

51. 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?

Correct Answer: (a)
Solution:

52. There are 10 points lie on a circle. By joining points how many triangles can be drawn from these points ?

Correct Answer: (c) 120
Solution:

53. If we select 3 persons randomly from a group, consisting of 4 men, 3 women and 2 boys, then the probability that 2 men are selected is:

Correct Answer: (a)
Solution:

54. An urn contains 10 black and 5 white balls. Two balls are drawn from the urn one after the other without replacement. What is the probability that both drawn balls are black?

Correct Answer: (b)
Solution:

55. Two dice are thrown simultaneously. Find the probability of getting a sum of 8 ?

Correct Answer: (b)
Solution:

56. A box contains 2 black, 6 green and 4 yellow balls. If 2 balls are picked up at random, the probability that both are yellow is:

Correct Answer: (d)
Solution:

57. Kings and Queens of black color are taken out from a deck of 52 playing cards. A card is drawn from the remaining well-shuffled cards. Probability of getting a spade card is:

Correct Answer: (c)
Solution:

58. A bag contains balls numbered 1, 2, 3, ………. 30. One ball is drawn from the bag at random. What is the probability that the number on the ball drawn is divisible by 4 or 6?

Correct Answer: (b)
Solution:

59. A bag contains balls numbered 1, 2, 3, ……...29. One ball is drawn from the bag at random. What is the probability that the number on the ball drawn is divisible by 3 or 5 ?

Correct Answer: (c)
Solution:

60. Daniel speaks truth in 2/5 cases and Sherin lies in 3/7 cases. What is the percentage of cases in which both Daniel and Sherin contradict each other in stating a fact?

Correct Answer: (b) 51.4%
Solution: