Re: [計量] PP1-DS-23,35

看板GMAT (GMAT入學考試)作者restingbeast (我跟另一個我)時間16年前 (2008/02/13 23:29)推噓1(1推 0噓 0→)

留言1則, 1人參與討論串2/2 (看更多)

※ 引述《slin (slin)》之銘言： : 23. 1653-!-item-!-187;#058&000843 : At least 100 students at a certain high school study Japanese. If 4 percent : of the students at the school who study French also study Japanese, : do more students at the school study French than Japanese? : (1) 16 students at the school study both French and Japanese. : (2) 10 percent of the students at the school who study Japanese also : study French. : 答案選 B : 我不懂的是選項二中,who study Japanese also study French 跟題目的study French : also study Japanese是不一樣的意思嗎?? 題目中的意思為"學校裡修習法文的人"中有4%也修日文選項二的意思為"學校裡修習日文的人"中有10%也修法文這個4%的人數與10%的人數其實是一樣多的(也就是兩者都修的人數，設為x) 所以學校中修法文的人數為 x / 4% = 25x 學校中修日文的人數為 x / 10% = 10x 答案為B A應該就不用講了 : 35. 3076-!-item-!-187;#058&003114 : If p and n are positive integers and p > n, what is the : remainder when p^2 - n^2 is divided by 15 ? : (1) The remainder when p + n is divided by 5 is 1. : (2) The remainder when p - n is divided by 3 is 1. : 答案選 E 沒有想到很直接的方法所以我用列舉的來試驗 p + n = 6 . 11 . 16 . 21 . 26 ........ p - n = 4 . 7 . 10 . 13 . 16 ....... 逐一試驗找到 p = 10 n = 6 這一種解 (p^2 - n^2) / 15 的餘數為4 另找到 p = 14 n = 7 另一解 (p^2 - n^2) / 15 的餘數為12 無法符合所以選E 若有錯請指正謝謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.228.45.29