Three molecules of type A, three of type B, three of type C, and three of type D are to be linked together to form a chain molecule. One such chain molecule is ABCDABCDABCD, and another is BCDDAAABDBCC. (a) How many such chain molecules are there? [Hint: If the three A's were distinguishable from one another-A₁, A₂, A3- and the B's, C's, and D's were also, how many molecules would there be? How is this number reduced when the subscripts are removed from the A's?] chain molecules (b) Suppose a chain molecule of the type described is randomly selected. What is the probability that all three molecules of each type end up next to one another (such as in BBBAAADDDCCC)? (Round your answer to eight decimal places.)
Three molecules of type A, three of type B, three of type C, and three of type D are to be linked together to form a chain molecule. One such chain molecule is ABCDABCDABCD, and another is BCDDAAABDBCC. (a) How many such chain molecules are there? [Hint: If the three A's were distinguishable from one another-A₁, A₂, A3- and the B's, C's, and D's were also, how many molecules would there be? How is this number reduced when the subscripts are removed from the A's?] chain molecules (b) Suppose a chain molecule of the type described is randomly selected. What is the probability that all three molecules of each type end up next to one another (such as in BBBAAADDDCCC)? (Round your answer to eight decimal places.)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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please help me solving the question a) and b).
![Three molecules of type A, three of type B, three of type C, and three of type D are to be linked together to form a chain
molecule. One such chain molecule is ABCDABCDABCD, and another is BCDDAAABDBCC.
(a) How many such chain molecules are there? [Hint: If the three A's were distinguishable from one another-A₁, A₂, A3- and
the B's, C's, and D's were also, how many molecules would there be? How is this number reduced when the subscripts are
removed from the A's?]
chain molecules
(b) Suppose a chain molecule of the type described is randomly selected. What is the probability that all three molecules of
each type end up next to one another (such as in BBBAAADDDCCC)? (Round your answer to eight decimal places.)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7afdb6c4-3a61-4c47-91da-dfd2e9ec1a67%2Fd64c334d-47fc-4418-8f98-3ecf52f629e3%2Fzuldeys_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Three molecules of type A, three of type B, three of type C, and three of type D are to be linked together to form a chain
molecule. One such chain molecule is ABCDABCDABCD, and another is BCDDAAABDBCC.
(a) How many such chain molecules are there? [Hint: If the three A's were distinguishable from one another-A₁, A₂, A3- and
the B's, C's, and D's were also, how many molecules would there be? How is this number reduced when the subscripts are
removed from the A's?]
chain molecules
(b) Suppose a chain molecule of the type described is randomly selected. What is the probability that all three molecules of
each type end up next to one another (such as in BBBAAADDDCCC)? (Round your answer to eight decimal places.)
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