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108年 - 108 國立中山大學_碩士班招生考試_資工系(資安):離散數學與演算法#105778
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題組內容
3. Let
be sets from a uni verse
.
(b) Negate the result in part (a) to determine when
.
其他申論題
(a) there must be seven men and seven women?
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(b) there must be at least eight men?
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2. Verify that , for primitive statements , and .
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(a) Wiite a quantified statement to express the proper subset relation .
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4. (a) Consider an chessboard. It contains eighty-one squares and one square. How many squares?
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(b) Now consider an chessboard for some fixed . ForI , how many squares are contained in this chessboard?
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5. Let be a set of five positive integers the maximum of which is at most 9. Prove that the sums of the elements in all the nonempty subsets of S cannot all be distinct.
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6. (a) Fermat's Theorem. If is a prime, prove that for each .
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(b) Buler's Theorem. For each n Ezt,n > 1, and each a EZ, prove that if gcd(a,n) = 1, then (a中(n) = 1(mod n).
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(a).
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