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Question 2 Three molecules of type A, three of type B, three of type C and three of type D are to he linked together

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Question 2 Three molecules of type A, three of type B, three of type C and three of type D are to he linked together to form a chain molecule. One such chain molecule is ABDDABA CC'CDB. (a) Calculate the number such chain molecules can be formed. (3 marks) (b) In how many ways can three molecules of each type end up next to one another? {2 marks) (Total: 5 marks)

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