GWD有题不懂~急求教各位大牛~

傻熊有傻福

1.For any integer k greater than 1, the symbol k^* denotes the product of all the fractions of the form , where t is an integer between 1 and k, inclusive.What is the value of 5*/4*?
2.GWD-1 Q9
A gardener is going to plant 2 red rosebushes and 2 white rosebushes.If the gardener is to select each of the bushes at random, one at a time, and plant them in a row, what is the probability that the 2 rosebushes in the middle of the row will be the red rosebushes?



A.1/12

B.1/6

C.1/5

D.1/3

E.1/2

怎么做?
3.If 10⁵⁰ – 74 is written as an integer in base 10 notation, ...
这句话怎么翻译？
谢谢~

傻熊有傻福

我查了下 你第一题貌似题目抄漏了，fraction of the form 1/t.
这样的话5*等于1/5! 4*等于1/4!  答案应该是1/5

第二题 WRRW  p=1/2*2/3*1/2=1/6

第三题 是指写成科学计数法

-- by 会员 chasedream321 (2011/8/8 15:41:16)

非常感谢！

chasedream321

我查了下 你第一题貌似题目抄漏了，fraction of the form 1/t.
这样的话5*等于1/5! 4*等于1/4!  答案应该是1/5

第二题 WRRW  p=1/2*2/3*1/2=1/6

第三题 是指写成科学计数法