[計量] 快考試了!!幾題請教~

看板GRE (GRE入學考試)作者 (Paddy)時間15年前 (2011/04/10 21:48), 編輯推噓1(107)
留言8則, 2人參與, 最新討論串1/1
以下都是猴哥的題目 1.Sixty-eight people are sitting in 20cars and each car contains at most 4 people. What is the maximum possible number of cars that could contain exactly 1 of the 68 people? ANS.4 5.The "reflection" of a positive integer is obtained by reserving its digit. For example, 321 is the reflection of 123 The difference between a five-digit integer and its reflection must be divisible by which of the following? ANS.9 70.How many positive integers can be expressed as a product of two or more of the prime numbers 5, 7, 11, 13 if no one product is to include the same prime factor more than once? ANS.11 大概都是英文問題 囧 還請版友們幫幫忙囉! PS.剩下三天就考試了,從國中開始就是數學白痴 真的很怕上不了800阿...大家有什麼好建議嗎? -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 123.205.55.27

04/10 22:06, , 1F
第一題就是最多能有幾台車只有一個人
04/10 22:06, 1F

04/10 22:06, , 2F
4X+Y = 68, X+Y=20, Y=4
04/10 22:06, 2F

04/10 22:07, , 3F
第二題5位數和其reflection的差會被哪個數字整除
04/10 22:07, 3F

04/10 22:08, , 4F
代ABCDE和EDCBA的差(A-E)(B-D)0(D-B)(A-E)
04/10 22:08, 4F

04/10 22:08, , 5F
五個數字加起來是0所以能被九整除
04/10 22:08, 5F

04/10 22:09, , 6F
第三題就是5,7,11,13每個數字不重複能組成幾個數字
04/10 22:09, 6F

04/10 22:09, , 7F
C(4,2)+C(4,3)+C(4,4)
04/10 22:09, 7F

04/11 00:22, , 8F
感謝樓上這位大大 感恩!!
04/11 00:22, 8F
文章代碼(AID): #1DeRKzL_ (GRE)
文章代碼(AID): #1DeRKzL_ (GRE)