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(a) How many different strings of 6 characters can be made from 8 characters A, B, C, D, E, F, G, H if each character

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(a) How many different strings of 6 characters can be made from 8 characters A, B, C, D, E, F, G, H if each character appears at most one time in each string? For example, string is \"ABCEFH\" is valid. Explain and evaluate your answer. (b) A student needs to enrol 3 subjects from 8 available subjects for her last semester. How many different choices of 3 subjects that she can make? Explain and evaluate your

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