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Probability QUESTIONS

Exam NameProbability QUESTIONS
DescriptionProbability QUESTIONS and Answers exams contains the questions from various competitive exams.These questions are the part of previous year paper.These kind of questions would be helpful in preparing for exams like IAS, PCS, UPSC, NDA, CDS SSC, RRB, PSC, IBPS
Exam TypeMASTER EXAM
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creatorAnirudh(39069)

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

Answer:1/9


Question: Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even ?

Answer:3/4


Question: From a pack of 52 cards, two cards are drawn together at random. What is the probability of both the cards being kings ?

Answer:1/221


Question: Two cards are drawn together from a pack of 52 cards. The probability that one is a spade and one is a heart, is:

Answer:13/102


Question: A bag contains 4 white, 5 red and 6 blue balls. Three balls are drawn at random from the bag. The probability that all of them are red, is;

Answer:2/91


Question: 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 ?

Answer:10/21


Question: In a box, there are 8 red, 7 blue and 6 green balls, One ball is picked up randomnly. What is the probability that it is neither red nor green ?

Answer:8/21


Question: A speaks truth in 75% cases and B in 80% of the cases. In what percentage of cases are they likely to contradict each other, narrating the same incident ?

Answer:35%


Question: A box contains 5 green, 4 yellow and 3 white marbles are drawn at random. What is the probability that they are not of the same colour ?

Answer:41/44


Question: An unknown man is found murdered. The corpse has one gold plated tooth. right ear is
pierced and a healed fracture of left hand thumb. A man with these characteristics is reported
missing. What are the chances (probability) of the corpse being the missing man? (Given the
occurrence of the gold-plated teeth in the atea, 1 in 5000, left hand thumb fractures 1 in 20000
and of right ear pierces 1 in 100).


Answer:1 in 10.000.000.000


Question: A fair coin is tossed thrice. The probability of getting atleast two heads is:



Question: The probability of getting a sum of 10 in the throw of two dices is:

Answer:1/12


Question: Two fair dice are thrown. Given that sum of two numbers obtained is 8. the probability that one of the numbers 2, will be:

Answer:1/18


Question: The probability of two persons being born on the same day (ignoring date) will be:

Answer:1/365


Question: In tossing of three fair coins at a time, the probability of getting at most one head is:

Answer:7/8


Question: There are two groups of students are consisting of 4 boys and 2 girls and the other 3 boys and one girl. One student is to be selected from each of the two groups. What will be the probability of one boy and one girl being selected ?

Answer:None of the above


Question: What is the probability of two persons being born on different days (ignoring the date) ?

Answer:364/365


Question: A bag contains 20 tickets marked with numbers 1 to 20 . One ticket is drawn at random. Find the probability that is will be multiple of 2 or 5

Answer:0.6


Question: Suppose p is the number of cars per minute passing through a certain road junction between 5 PM
and 6 PM, and p has a Poisson distribution with mean 3. What is the probability of observing fewer
than 3 cars during any given minute in this interval?


Answer:17/(2e^3)


Question: A man speaks the truth 3 out of 4 times.
He throws a die and reports it to be a 6.
What is the probability of it being a 6?


Answer:3/8