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# A Complete Guide on Multiplication Theorem

In this article we will cover definition of multiplication theorem, how to prove the multiplication theorem, formula of multiplication theorem. According to the law of multiplication, "the probability of occuring of given two events" or, to put it another way, "the probability of the intersection of given two events" is equal to the sum obtained by multiplying the probabilities of both occurrences.

The degree of an event’s likelihood is referred to as its probability. There must be some probability attached to an event as it happens, such as when a ball is thrown, a card is drawn, etc. Probability in mathematics is defined as the proportion of desired outcomes to all potential outcomes. Given that the first event has already happened, the likelihood that events A and B will occur simultaneously is equal to the product of the probabilities of the two events. The probability Multiplication Theorem refers to this.

The condition between two given events is described by the probability multiplication rule. A∩B represents the occurrences in which two events, A and B, connected to a sample space S, have occurred. In probability, this is often referred to as the multiplication theorem. The likelihood that the two given occurrences will occur concurrently is calculated by multiplying the probabilities of the two given events.

## Definition of Multiplication Theorem

The condition between two given events is described by the probability multiplication rule. A∩B represents the occurrences in which two events, A and B, connected to a sample space S, have occurred. In probability, this is often referred to as the multiplication theorem. The likelihood that the two given occurrences will occur concurrently is calculated by multiplying the probabilities of the two given events.

## How to Prove the Multiplication Theorem

Using the probability multiplication rule , we can derive

P (A ∩ B) = P (A) × P (B|A); if P(A) ≠ 0

P (A∩B) = P (B) × P (A|B); if P (B) ≠ 0

According to the probability multiplication theorem, the probability of two independent events, X and Y, occurring simultaneously in a random experiment is equal to the product of their probabilities.

P (A∩ B) = P (A) × P (B)

Additionally, the multiplication rule shows us that

P (A∩B) = P (A) × P (B|A)

Given that X and Y are separate events,

P (B|A) = P (B)

Then we obtain,

P (A∩B) =P (A) × P(B)

This indicates that the multiplication theorem is correct.

## Formula of Multiplication Theorem

According to the probability multiplication rule, the likelihood that events A and B will occur simultaneously is equal to the likelihood that B will happen multiplied by the likelihood that A will happen if B happens.

P(A∩B)=P(B)P(A|B) is a valid representation of the multiplication rule.

Simply multiplying both sides of the conditional probability equation by the denominator will yield the general multiplication rule of probability.

Probability Multiplication Rule for Dependent Events

Dependent events are ones in which the outcome of one event has an impact on the outcome of the other. Sometimes, the likelihood of the second event depends on whether the first event occurs.

P(A ∩ B) = P(A) P(B | A)

where A and B are independent events, follows from the theorem.

Probability Multiplication Rule for Independent Events

Events are considered to as independent events if the outcome of one event has no bearing on the outcome of another. For independent occurrences, the probability multiplication rule that applies to dependent events can be expanded. If the events A and B are independent, then

P(B | A)= P(B)

and the aforementioned theorem reduces to P(A ∩ B) = P(A) P(B). This implies that the likelihood of both of them happening at once is the sum of their individual probabilities.

## Conclusion

In this article, we learned The Multiplication Rule of Probability states that you should multiply the two probabilities to determine the likelihood that two events will occur together. The intersection of the two events is the term used to describe the likelihood of two occurrences happening together. The likelihood of many occurrences occurring simultaneously can be calculated using known probabilities of each event separately thanks to the multiplication rule. The particular and broad multiplication rules are the two variations of this rule.

Get answers to the most common queries related to the JEE Examination Preparation.

## What Is the Probability Multiplication Theorem?

Answer: The likelihood of two occurrences A and B happening at the same time, given that the first event has already...Read full

## The Multiplication Rule in Probability: Why Do We Use It?

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## What Does the Probability Multiplication Rule for Independent Events Mean?

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## Is the multiplication rule applicable to dependent events?

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## The probability of independent events is it multiplied?

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