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Question 10 (4 points) What is a big- estimate of the number of writing 2-letter strings over a fixed alphabet (e.g. the alphabet A={A, B,

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Question 10 (4 points) What is a big- estimate of the number of writing 2-letter strings over a fixed alphabet (e.g. the alphabet A={A, B, ..., Y, 2) but without using duplicate letters ? O o(n3) O o (n ? ) Oo(n!) O o(2")

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