Imagine that you flip a fair coin 20 times. This will create a sequence of heads and tails, and there are lots of possible sequences (just over one million equally likely microstates). Now, imagine looking for strings of consecutive H's or consecutive T's within each sequence of 20 flips. For instance, one sequence (one microstate) is THHTTTTHTHHHTTHHTTHT, which contains one string of four consecutive T's, one string of 3 consecutive H's, and many strings of two consecutive H's and T's.

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Chapter1: Combinatorial Analysis
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Imagine that you flip a fair coin 20 times. This will create a sequence of heads and tails, and there are lots of possible sequences (just over one million equally likely microstates).

Now, imagine looking for strings of consecutive H’s or consecutive T’s within each sequence of 20 flips. For instance, one sequence (one microstate) is THTHTTTHHHHTHHTHTTTT, which contains one string of four consecutive T’s, one string of 3 consecutive H’s, and many strings of two consecutive H’s and T’s.

Let’s focus on the LONGEST string of consecutive H’s or T’s in each 20-coin sequence and define the LENGTH of the longest string to be the “macrostate” for that particular microstate. In the example above, the macrostate is “4”, because the longest string is a string of four consecutive T’s.

(a) How many microstates are there for macrostate = 1? Explain. How many microstates are there for macrostate = 20? Explain. How many microstates are there for macrostate = 19? Explain.

(b) What are the five most likely macrostates? What is the probability that each of these macrostates occurs?
Transcribed Image Text:Imagine that you flip a fair coin 20 times. This will create a sequence of heads and tails, and there are lots of possible sequences (just over one million equally likely microstates). Now, imagine looking for strings of consecutive H’s or consecutive T’s within each sequence of 20 flips. For instance, one sequence (one microstate) is THTHTTTHHHHTHHTHTTTT, which contains one string of four consecutive T’s, one string of 3 consecutive H’s, and many strings of two consecutive H’s and T’s. Let’s focus on the LONGEST string of consecutive H’s or T’s in each 20-coin sequence and define the LENGTH of the longest string to be the “macrostate” for that particular microstate. In the example above, the macrostate is “4”, because the longest string is a string of four consecutive T’s. (a) How many microstates are there for macrostate = 1? Explain. How many microstates are there for macrostate = 20? Explain. How many microstates are there for macrostate = 19? Explain. (b) What are the five most likely macrostates? What is the probability that each of these macrostates occurs?
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