# A Closer Look at One of the Scenes from 21 (2008)

Apr 8, 2024 | Articles

Movies are all about storytelling as portrayed by numerous scenes played by different characters. And some of these scenes tend to be iconic and resonate with viewers, as they are pivotal to the overall plot of the movie.

One such scene occurs in the movie 21, where a group of intelligent students explore probability theory as led by their Professor. This scene, popularly known as the Monty Hall scene, sets the tone of the movie while also giving a lesson on mathematical reasoning and strategic thinking. As is later seen in the movie, it can then be applied both at land-based gambling hubs and also while playing casino online – it works all round. In this article, we will delve into the Monty Hall probability problem, how to resolve it, and its overall implications.

## The Beginning…

The movie 21 sets the stage with a smart student at MIT named Ben Campbell who alongside his professor and fellow students takes on an almost impossible challenge. They decide to take on the casinos of Las Vegas while armed with their mathematical skills.

However, early in the movie, the Professor named Rosa (played by Kevin Spacey) discusses the concept of probability with his students. To put this concept in perspective, he uses the popular Monty Hall problem. Using this puzzle that has thrown several great minds into confusion, Professor Rosa engages his students in a discussion about the blend between probability and decision-making.

## The Monty Hall Probability Problem

This scene unravels in a classroom setting as a discussion between students including Ben Campbell and Professor Rosa. Now, let’s look into what this probability problem entails.

The Monty Hall problem is named after the host of the TV game show “Let’s Make A Deal”. This problem seems to be straightforward albeit a seemingly simple choice presents multiple outcomes. In simple terms, the scenario goes thus: “You are to choose between three doors, behind one of which lies a prize (a car). As for the other two doors, they conceal less valuable prizes (goats). Now, you, as the contestant, then choose one door, and then the host, knowing what each door conceals, opens a different door than the one picked to reveal a goat. The host then offers you an option to either stick with your earlier option or switch to the other unopened door.”

Putting this scenario in mind, the question now is should the contestant keep to their initial choice or should they switch choices to improve their chances of winning the car?

## How To Navigate This Problem According to Professor Rosa

In this Monty Hall scene, the Professor breaks down for his students the probabilities of each outcome. At the beginning of this puzzle, the chance of picking a car was 33.33% but after the presenter opened a door, the probability of winning increased to 66.67%. This simple calculation, although seemingly counterintuitive, tends to surprise and confuse those who are unfamiliar with this problem. However, based on careful analysis and use of information asymmetry, Professor Rosa shows that switching your choice is the best way to improve your chances of winning.

This scene thus serves as a significant moment in the movie’s plot as it displays the mathematical prowess of the students and the Professor. It also provides the basis for the subsequent use of strategy in card-counting at Las Vegas casinos.

## The Impact of This Scene Today

This scene plays a very pivotal role in today’s world as it carries significance in varying aspects. Here are some of them:

• Psychological Insights: This Monty Hall scene in the movie proved to be the compelling and illustrative solution that psychologists and researchers have been looking for in relation to this problem. This tension between wanting to switch choices and sticking with the initial choice brings clarity to human decision-making and the cognitive shortcuts that tend to lead us astray.
• Educational Value: This scene also dishes some educational insight allowing viewers to explore the world of mathematical reasoning and critical thinking. It gives an example of the real-world application of probability theory in solving problems and making decisions.
• Cultural Implications: Lastly, this scene holds some pop-cultural connotations in that it sparks debates and discussions among viewers. It serves as a premise for exploring mathematical puzzles in relation to probability concepts and game theory.

## The End

It is important to note that the Monty Hall probability scene is not only a plot device. Instead, it is in fact an exploration of the mathematical world and how it relates to cognitive thinking and decision-making. As the audience keeps revisiting this iconic scene, we expect that its legacy will continue to endure for years on end.

Thomas B.