What are Factorials, Permutations, and Combinations?

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Homework Help Overview

The discussion revolves around understanding factorials, permutations, and combinations, specifically in the context of evaluating given mathematical expressions. The original poster presents a series of questions that include examples like P(10,3) and 9!, and expresses uncertainty regarding a particular expression, suggesting it might be a combination.

Discussion Character

  • Exploratory, Conceptual clarification

Approaches and Questions Raised

  • Participants discuss the nature of the expressions presented, with some suggesting that the expression in question is likely a combination, specifically 25C5. There is also clarification sought regarding the terminology used by the original poster, as they initially refer to a "series" but later clarify it as a "list" of questions.

Discussion Status

The discussion is ongoing, with participants attempting to clarify terms and confirm interpretations of the expressions involved. Some guidance has been offered regarding the identification of combinations, but there is no explicit consensus on the interpretation of the original poster's query.

Contextual Notes

The original poster mentions having multiple questions, which may include different types of problems related to factorials, permutations, and combinations, indicating a variety of contexts within the homework assignment.

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Homework Statement



I am asked "evaluate the following factorials, permutations, and combinations". I am given a series of questions I understand, like P(10,3), 9!, etc. But then I have a series like this:

9a3b4bfb4a4f.jpg


Homework Equations




9a3b4bfb4a4f.jpg



The Attempt at a Solution



I am not sure what this is, is it a combination, perhaps because there hasn't been any yet, and this is solved by 25C5?
 
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I'm not sure what you mean by a series, but usually , yes, it is 25C5.
 
Bacle2 said:
I'm not sure what you mean by a series, but usually , yes, it is 25C5.

Sorry, I ment a list, as in I have 10 questions, with a few looking like the one on the photo, a few looking like 9!, and a few looking like p(10,3). =)
 
Oh, O.K, makes sense, maybe I was kind of thick.
 

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