Check the confirmed JJ 8-24
116：Q 题目说下面那一个不可能是多边形的对角线个数
A 5 B 6 C 9 D14 E21？
要注意一个单词：polygon 是多边形
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Does anybody know how to calcuate the number of diagonals of polygon? thanks!
112.Q: 8苹果6个好的取4个至少1个坏的概率,
A::55.【确定】
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My answer: 1-C6,4/C8,4=11/14 =78.6% . Is that correct?
102、Q:how many square feet of carpeting that will be need to cover the floor that 14 feet long
(1) perimeter 52
(2) the greatest distance of 2*根号 85
A: D【确定】
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How do you know it is regular shape? E or uncomplete issue.
89. Q: 如果一个定单的书价低于$15,则运费为$3,如果一个定单的书价高于$15,则运费为书价的20%,问两个定单X和Ｙ的运费总共为多少？
1)Ｘ的书价加Ｙ的书价＝$18.75
2)X的书价和Y的书价都高于$4
A: A【确定】
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My answer: C for example: (15,3.75) or (16,2.72) will get different answers.
86. Q 8人选2人，A去，B不去的概率。
A: 6/C(8，3)【确定】
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6/C(8,2)
7。Q:There are 8 books, 6 of them are paperbooks and 2 of them are hardbooks. What is the combination of at least one hardbook?
A: 40【确认】
R: C(2,1)*C(6,3)=40
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I think the question isn't clear? please advise!
5。Q:Is integer n a square of integer?
1)4n is a square of integer
2)n^3 is a square of integer
A: C【确认】
R:for 1,n maybe 1/4,insufficient;
for 2,n maybe 根号3,so insufficient
1+2,N must be integer,so C
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D, since n is integer
Thank! |
