※ 引述《oranger (从新出发)》之铭言： : 202. : Each employee of Company Z is an employee of either Division X or Division Y, : but not both. If each division has some part-time employees, is the ratio of : the number of full-time employees to the number of part-time employees : greater for Division X than for Company Z ? : (1) The ratio of the number of full-time employees to the number of part-time : employees is less for Division Y than for Company Z. : (2) More than half of the full-time employees of Company Z are employees of : Division X, and more than half of the part-time employees of Company Z are : employees of Division Y. : Ans: D : 请大家帮忙了!! 谢谢~ 引用PP解答的解法，但是也是不严谨的解法，看起来有点投机，希望有数学强者能分享 更严谨的思维。 题目问 f(x) + f(y) f(x) ______________ < ______ ? p(x) + p(y) p(x) 条件1: f(y) f(z) ____ < ____ p(y) p(z) 把公司整体当成1 ，所以f(x)+f(y)=1， p(x)+p(y)=1 所以任意带入数字检查，ex: 0.8+0.2 0.8 _________ < _____ 0.4+0.6 0.4 因为条件一的限制，所以 f(y)/p(y) 不能大於或等於 1 ，在满足其条件下 代数字进去都会满足 f(z)/p(z) < f(x)/p(x) 所以sufficient。 条件2: Division X 超过一半是full time ，Division Y超过一半是 part time 同理，带入上述式子 ex: 0.6 0.4 0.6 ________ + ___ < ____ 0.4 0.6 0.4 所以sufficient --

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