?

　　Males and females are observed to react differently to a given set of circumstances. It has been observed that 70% of the females react positively to these circumstances, whereas only 40% of males react positively. A group of 20 people, 15 female and 5 male, was subjected to these circumstances, and the subjects were asked to describe their reactions on a written questionnaire. A response picked at random from the 20 was negative. What is the probability that it was that of a male?

Suppose that two balanced dice are tossed repeatedly and the sum of the two uppermost faces is determined on each toss. What is the probability that we obtain

a. a sum of 3 before we obtain a sum of 7?

b. a sum of 4 before we obtain a sum of 7?

In a game, a participant is given three attempts to hit a ball. On each try, she either scores a hit, H, or a miss, M. The game requires that the player must alternate which hand she uses in successive attempts. That is, if she makes her first attempt with her right hand, she must use her left hand for the second attempt and her right hand for the third. Her chance of scoring a hit with her right hand is .7 and with her left hand is .4. Assume that the results of successive attempts are independent and that she wins the game if she scores at least two hits in a row. If she makes her first attempt with her right hand, what is the probability that she wins the game?

A fleet of nine taxis is to be dispatched to three airports in such a way that three go to airport A, five go to airport B, and one goes to airport C. (a) In how many distinct ways can this be accomplished? (b) If exactly one of the taxis is in need of repair, what is the probability that it is dispatched to airport C? (c) If exactly three of the taxis are in need of repair, what is the probability that every airport receives one of the taxis requiring repairs?

Students attending the University of Florida can select from 130 major areas of study. A student’s major is identified in the registrar’s records with a two-or three-letter code (for example, statistics majors are identified by STA, math majors by MS). Some students opt for a double major and complete the requirements for both of the major areas before graduation.

The registrar was asked to consider assigning these double majors a distinct two- or three-letter code so that they could be identified through the student records’ system.

What is the maximum number of possible double majors available to University of Florida students?

If any two- or three-letter code is available to identify majors or double majors, how many major codes are available?

How many major codes are required to identify students who have either a single major or a double major?

Are there enough major codes available to identify all single and double majors at the University of Florida?

部隊全長為600公尺，以等速直線行軍，班兵葉大同因答數錯誤被罰自部隊尾端等速跑到部隊前端繞過余班長，再以原速率跑回隊尾，此時整個部隊恰好前進600公尺，試求葉大同全程移動路徑長為多少？

　　普通高中每星期上５天課，每天排７節課；而高二的課程中每週有６節數學課，為了學習效果，每天只排一或二節，而且下午第一節不排，請問高二數學課有多少種排法？

　　為什麼在英漢字典裡的＂英磅＂單位換算，有出現一英磅等於十六盎斯，也有一英磅��於十二盎斯，到底這兩者有什麼不同的地方呢？

　　請專家幫忙指點迷津吧！

　　請問＂黃燕燕＂這個姓名的吉凶如何？請給個意見，謝謝！

現在正式開始今天的研討會。首先，歡迎今天的第一位報告者－比爾。謝謝比爾的報告。休息十分鐘，8:30繼續開始今天的會議。今天的會議到此結束，謝謝大家的參與。有任何問題嗎？請立即提出。

依據電化學原理的差異，可以大致分成哪幾種方法？其中，若使用三個電極（工作電極、輔助電極、參考電極），與使用用兩個電極的差異在哪裡？謝謝！

　　歐元硬幣的正面圖案由歐盟統一規定，背面圖案則由各國依據國家特色自行設計。請問下列硬幣圖騰與國家特色配對正確的是：

　(A)達文西人體比例圖－希臘

　(B)騎在牛背上的歐羅芭女神－法國

　(C)代表該國精神的老鷹－英國

　(D)湖泊、森林、天鵝－芬蘭

　　除此之外，也請說明錯誤答案的正確國家。謝謝！

　　若√3=1.732，用四捨五入法求(5+√13)/(2-√3)的近似值到小數點後第二位為多少？要有列式哦！

蘿蔔開花與光線有何關聯？煩請專家解答！

大寶買一本380元的故事書後，剩下的錢可以買15元的自動鉛筆4枝，大寶原有多少錢？

若一三角形有一邊長5，另兩邊長皆為整數，且和為9，則這種三角形有幾種？

　　請問個人的生辰八字如下：農曆甲辰年八月九日寅時生，請問大師：個人一生的運勢及未來一年（民國九十八年）的運勢，以便規劃未來的動向。

九年一貫課程的利與弊為何？九年一貫課程的利與弊為何？

　　個人的生辰八字如下：農曆乙巳年六月十八日卯時生，請問大師：個人一生的運勢及未來一年（民國九十八年）的運勢，以便規劃未來的動向。

　　請問各位化學專家：石墨轉變為金剛石到底是物理變化？還是化學變化呢？或者是兩者皆是呢？要說明原因，不要單單只有回答而已，要看回答的理由是否正確哦！趕快救救我吧！

　　在以下的檔案－http://jflairf.googlepages.com/AB06.pdf%EF%BC%8C%E...