[計量] A bowl contains red, green, ...
1. A bowl contains red, green, and white balls. The probability of
choosing a red ball is 1/3.There are 5 more green balls than red
ones, and there are 12 white balls total. What is the odds against
chossing a white ball?
a.12/39 b.12/51 c.13/4 d.17/4 e.12/22
Ans: C
我算出來紅、綠、白球各是 17, 22, 12 顆
但是我實在不懂最後一句是甚麼意思???
2. Marigolds are to be planted inside a circular flower garden so that there
are 4 marigolds per square foot. The circumference of the garden is 20 feet.
If marigolds are available only in packs of 6, how many packs of flowers are
needed?
a.13 b.14 c.20 d.21 e.22
Ans: E
如果花園的周長是20的話 那麼面積不就是 (10/拍)^2
然後 (10/拍)^2 * 4 / 6 怎麼會是22呢???
這題怎麼算都怪怪的....是我理解錯誤嗎??
3.Which of the following express the area of a circle in terms of C,
its circumference??
a. C^2/4拍 b.C^2/2拍 c. 根號C/2拍 d.c拍/4 e.C/4拍
Ans: A
4. 若 1 < a < b < 2 要怎麼證明 a+b > ab 呢??
我快要考試了所以想解決對這些問題的疑惑
不知道要怎麼表達根號和拍 所以用文字表達 希望大家看得懂
非常感謝~
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