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a) Suppose in a university, each subject offered to students has a subject code consisting of three letters followed by five digits. 1 . How

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a) Suppose in a university, each subject offered to students has a subject code consisting of three letters followed by five digits. 1 . How many different subject codes are possible? (1 mark) ii. How many subject codes could begin with CS and end with digit 3 or 2? (2 marks) How many subject codes are possible in which all the letters and the digits are distinct? (2 marks)

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