Probability Test

Result

Probability Test - 54

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Weekly Quiz Competition

Question 1
4 / -1

A box contains 10 mangoes out of which 4 are rotten. 2 mangoes are taken out together. If one of them is found to be good, the probability that the other is also good is

A

B

C

D

Solution
Question 2
4 / -1

Out of 13 applicants for a job, there are 5 women and 8 men. It is desired to select 2 persons for the job. The probability that at least one of the selected persons will be a woman is

A

B

C

D

Solution
Question 3
4 / -1

Two numbers a and b are chosen at random from the set of first 30 natural numbers. The probability that a² – b² is divisible by 3 is

A

B

C

D

Solution
Question 4
4 / -1

Two friends A and B have equal number of daughters. There are three cinema tickets which are to be distributed among the daughters of A and B. The probability that all the tickets go to daughter of A is 1/20. The number of daughters each of them have is

A
4

B
5

C
6

D
3

Solution
Question 5
4 / -1

Dialing a telephone number an old man forgets the last two digits remembering only that these are different dialed at random. The probability that the number is dialed correctly is

A

B

C

D
None of these

Solution
Question 6
4 / -1

Let A and B be two finite sets having m and n elements respectively such that m ≤ n. A mapping is selected at random from the set of all mappings from A to B. The probability that the mapping selected is an injection is

A

B

C

D

Solution
Question 7
4 / -1

There are 5 letters and 5 addressed envelopes. If the letters are placed at random, the probability that exactly 3 letters are placed in right envelope is

A

B

C

D

Solution
Question 8
4 / -1

From a group of 7 men and 14 ladies a committee of 6 persons is formed, then the probability that the committed contains 2 ladies is

A

B

C

D

Solution
Question 9
4 / -1

A bag contains 4 white and 3 red balls. Two draws of one ball each are made without replacement. Then the probability that both the balls are red is

A

B

C

D

Solution
Question 10
4 / -1

A bag contains 5 white, 7 black and 4 red balls. Three balls are drawn from the bag at random. The probability that all the three balls are white, is

A

B

C

D

Solution