※ 引述《catspace (柏拉圖的永恆...)》之銘言： : ※ 引述《minie (散落在我手中的是溫柔)》之銘言： : : GWD-01-Q2 : : If 2 different representatives are to be selected at random from a group of : : 10 employees and if p is the probability that both representatives selected : : will be women, is p > 1/2 ? : : (1) More than 1/2 of the 10 employees are women. : : (2) The probability that both representatives selected will be men is : : less than 1/2 : : ANS:E : : GWD-01-Q15 : : If p is the product of the integers from 1 to 30, inclusive, what is the : : greatest integer k for which 3^k is a factor of p? : : A.10 : : B.12 : : C.14 : : D.16 : : E.18 : : 請問有快速的算法嗎 ANS:C : : GWD-01-26 : : If the units digit of the three-digit positive integer k is nonzero, what is : : the tens digit of k? : : (1) The tens digit of k + 9 is 3. : : (2) The tens digit of k + 4 is 2. : : ANS:A : : GWD-02-02 : : When positive integer x is divided by positive integer y, the remainder is 9. : : If x/y = 96.12, what is the value of y? : : A.96 : : B.75 : : C.48 : : D.25 : : E.12 : : ANS:B : : GWD-02-08 : : The operation $ is defined for all nonzero numbers a and b by a $ b = a/b – : : b/a. If x and y are nonzero numbers, which of the following statements must : : be true? : : I.x $ xy = x(1 $ y) : : II.x $ y = -(y $ x) : : III.1/x $ 1/y = y $ x : : A. I only : : B. II only : : C. III only : : D. I and II : : E. II and III : : ANS:E : : GWD-02-17 : : Q17: : : If a and b are positive, is (a^-1 + b^-1)-1 less than (a^-1 b^-1)-1? : : (1) a = 2b : : (2) a + b > 1 : : ANS:B : : GWD-02-22 : : A construction company was paid a total of $500,000 for a construction : : project. The company’s only costs for the project were for labor and : : materials. Was the company’s profit for the project greater than $150,000? : : (1) The company’s total cost was three times its cost for materials. : : (2) The company’s profit was greater than its cost for labor. : : ANS:C : : 以上題目都是想很久想不通的 : : 先謝謝各位的幫忙 : 01-02 : C6取2 1 : (1) 女性至少6個，P > ------- = --- ......insufficient : C10取2 3 : (2) 只知道 P(both women) + P(one man & one woman) > 1/2 ......insufficient : (1)+(2) 仍然insufficient # : ------------------------------------------------------- : 01-15 : 你把1~30裡"3的倍數"列出來，看有幾個3的乘積 : 3、6、9、12、15、18、21、24、27、30 共有14個3的乘積 Ans: C # 可以請教一下為什麼是14個三的乘積，不是十個? 不好意思我數學不好 謝謝 : ------------------------------------------------------- : 02-02 : x/y = 96.12 = 96 + 12/100 = 96 + 3/25 = 96 + 9/75 : y = 75 # 這題好酷^^ : ------------------------------------------------------- : 02-08 : I. x $ xy = 1/y - y =\= x(1/y - y) = x(1 $ y) : II. x $ y = x/y - y/x = - (y $ x) : III. 1/x $ 1/y = y/x - x/y = y $ x : 只有 II & III 正確 Ans: E # 這題我還是不懂，可否再加以解釋 謝謝 : ------------------------------------------------------- : 02-22 : 若題目成立題目則 L + M < 350000 : (1) L + M = 3M ， L = 2M ......insufficient : (2) 500000 - ( L + M ) > L ， 2L + M < 500000 ......insufficient : (1)+(2) 5M < 500000 ， M < 100000 ，代入(1)則 L < 200000 : L + M < 300000 .......sufficient Ans: E # 所以應該是答案有誤 謝謝C大的指導 --

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