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Discrete Math : Set Relations

Let SIGMA = {a,b} be an alphabet.
a. List between braces the elemnts of SIGMA4. the set of strings of length over SIGMA.
b. Let A = SIGMA1 U SIGMA2 and B = SIGMA3 U SIGMA4. Describe A, B and AUB in plain English.

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a) The strings of length four given the alphabet {a,b} is as ...

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Set relations are investigated.

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