Joint probability mass function

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SUMMARY

The discussion focuses on understanding the joint probability mass function (PMF) for two coins, with outcomes represented as Ω = {HH, HT, TH, TT}. The probabilities PX,Y(x,y) are defined for various combinations of coin flips, specifically for (x,y) pairs such as (0,0), (1,0), (0,1), and (1,1). The user clarified that X = 0 corresponds to TT and X = 1 corresponds to HH, HT, or TH, while Y = 0 corresponds to HH and Y = 1 corresponds to HT, TT, or TH. The notation used in the problem was identified as incoherent, particularly the use of "n" instead of the intersection symbol.

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I'm having difficulties reading this, could someone please explain to me?

2 coins
Ω = {HH, HT, TH, TT}
0 = Tails
1 = Heads
PX,Y(x,y) = P({TT} n {HH}) for (x,y) = (0,0)
P({HH, HT,TH} n {HH}) for (x,y) = (1,0)
P({TT} n {TT, TH, HT}) for (x,y) = (0,1)
P({HH,HT,TH} n {TH,HT,TT}) for (x,y) = (1,1)
0 otherwise

PX,Y(x,y) = P(0) for (x,y) = (0,0)
P({HH}) for (x,y) = (1,0)
P({TT}) for (x,y) = (0,1)
0 otherwise
PX,Y(x,y) = 0.25 for (x,y) = (1,0)(0,1)
0.50 for(x,y) = (1,1)
0 otherwiseThat's basically the lay out i was given.
im not sure how to read for(x,y) = (0,0) and the others similar to it.

Solved it thank you, if anyone is curious i forgot to mention that X = 0 if the outcome equals to TT and if X = 1 for the outcome if it equals to HH HT TT..
Y = 0 if the outcome is equal to HH
Y = 1 if the outcome is equal to HT TT TH
 
Last edited:
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If your question is about how to read notation, the way you have presented the notation isn't coherent. For example, I think you are using "n" to mean the intersection symbol \cap.

If this notation comes from a problem, I suggest you post the problem in the homework section and quote the entire problem exactly.

Perhaps you can use LaTex: https://www.physicsforums.com/help/latexhelp/
 

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