Can P(C) be found using the method shown in the photo?

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Homework Help Overview

The discussion revolves around finding the probability P(C) related to missing stamps, specifically focusing on the conditions under which certain stamps are classified as used or unused. The problem involves understanding the implications of missing stamps in a probabilistic context.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between the events of missing stamps and their classification as used or unused. Questions arise regarding the validity of using a specific method to calculate P(C) based on the conditions provided in the problem statement.

Discussion Status

There is an ongoing exploration of the definitions and implications of the events related to the missing stamps. Some participants are clarifying the meaning of the events and questioning the assumptions made about the classification of the missing stamps. Guidance is being offered on how to frame the events in terms of probability.

Contextual Notes

Participants are discussing the constraints of the problem, including the specific number of missing stamps and their classification as used or unused. There is an emphasis on the need for clear definitions and comments on the working process to avoid confusion.

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Homework Statement



i have problem of finding P(C) , why can't i use the method as in the photo to find P(C) beacuse 1-(all unused stamps are missing)= at least 1 use stamps is missing.

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The Attempt at a Solution

 

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C is the event at least one of the used stamps is missing.

"all unused stamps are missing" would mean there are 14 stamps missing - but the problem statement says only three are missing.

Did you mean, "all missing stamps are "unused"" - but that is not correct either since at least one of them has to be "used".

even C is the same as "at most two of the missing stamps are unused"

You need to comment your working.
 
Ya I mean all the 3 stamps missing are unused.
 
So if you write: D:=event all three missing stamps are unused, then you want to argue that P(C)=1-P(D), is that what you are saying?
 

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