Contents

## Probability Notes & Questions

Here is a **quick Guide** for those who are preparing for an **IBPS** bank or other exams for “Probability”. This is the important topic in IBPS Clerk exam and IBPS **PO** exam. You will get Tricks & Tips with proper examples.Also, these Study Notes can be downloaded in PDF format.For getting good score in IBPS exam result then read the notes onĀ probability questions.

### What is probability

Probability is one of the important chapter for IBPS bank and other competitive exams like CAT.Most of the time set of 4-5 questions is asked in competitive exams which can be solved in minutes. A mathematical measure of uncertainty is known as probability.

### Random Experiment

An experiment in which all possible outcomes are known and the exact outcome can be not be determined is called a random experiment.

### Sample Space

Set of all possible results of a random experiment is known as sample space.

### Trial

The performance of a random experiment is called a trial.

### Event

It is a subset of sample space.

### Probability of occurrence of an event

Let S be the sample space and E be the event then E S.

Question 1:Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?

Question 2:A boy gets a chance of 55% to win 1st round of a game and a girl gets a chance of 60% to win 2nd round of the game. In what % of cases are they likely to contradict each other, narrating the same incident?

Question 3: In a class, there are 12 boys and 16 girls. One of them is called out by an enroll number, what is the probability that the one called is a girl?

Question 4:A box contains 6 bottles of variety1 drink, 3 bottles of variety2 drink and 4 bottles of variety3 drink. Three bottles of them are drawn at random, what is the probability that the three are not of the same variety?