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Question: what are the formulas in order to solve these questions...

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What are the formulas in order to solve these questions? The answers are already given, just want to know an easy way to solve these questions step by step. Thanks
1. (3pts) S-a, b), what is S x 25? S = {a, b) 25 0, (a), (b), a, b)) Sx2s = {(a,0), (a, {a)), (а, {b)), (a, {a, b), (b,0), (b, {a)), (b, {b}), (b, {a, b)) 2. Consider the expression (AUB)nA)) UB) (a) (4pts) Simplify ((AUB)nA))UB) (An A)U(BnA))) U B) -(COU(BnA))UB) = ((BUA) UB) - (BUB)UA -(u)UA
(b) (3pts) Show the expression tree Ul
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