Probability 1

Question 1

A number p is chosen at random from the numbers [-3, 3]. What is the probability that value of p < 2

• 3/7
• 5/7
• 4/7
• 1/7

Question 2

A box contains 6 black, 5 brown and 2 yellow balls. If 2 balls are selected at random, what is the probability that both are black?

• 4/23
• 5/26
• 7/26
• 8/15

Question 3

4 dices are thrown simultaneously. What is the probability that all the dices show the same number.

• 1/216
• 1/36
• 4/216
• 4/36

Question 4

An urn contains 12 red and 18 white marbles. Two marbles are drawn without replacement one after another. What is the probability that first is red and second is white?

• 16/145
• 9/32
• 36/145
• 5/32

Question 5

What is the probability that a number selected from numbers [1,30] is prime number?

• 1/3
• 2/7
• 5/9
• 5/30

Question 6

A bag contains 21 balls numbered 1 to 21. two balls are drawn one after another without replacement. Find the probability that both balls are even numbered.

• 3/14
• 2/3
• 6/9
• 1/8

Question 7

A 5 digit number is formed by using digits 1, 2, 3, 4 and 5 with no two digits same. What is the probability that the formed number is divisible by 4?

• 1/5
• 4/5
• 3/5
• 1/4

Question 8

A box having 5 black and 3 brown flags. Another box having 4 black and 6 brown flags. If one flag is drawn from each box. Find the probability that both flags are of different color.

• 21/40
• 10/19
• 3/8
• 3/10

Question 9

Ram speaks truth in 3/4 of cases and Shyam in 4/5 of cases. In what percent of cases while narrating the same event are they likely to contradict each other?

• 35%
• 25%
• 20%
• 40%

Question 10

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

• 1/3
• 1/6
• 1/9
• 1/12