各位大侠,有谁知道GWD第四套的数学第九题如何解啊?还有第24题我怎么算都应该是多了一元钱(B),是不是答案(C)给错了啊?恳请各位鼎力相助,多谢!
n从1-96随机取,问n*(n+1)*(n+2)能被8整除的概率
当n为偶数的时候,n+2必然也是偶数,而且n和n+2里面至少能有1个能被4整除,所以n取任何偶数都可以。一共有48个
n取奇数的时候,n,n+2都是奇数。n+1是偶数。如果n+1能被8整除,也可以。
7,15,23,31,39,47,55,63,71,79,87,95一共是12个。
总概率就是(48+12)/96=5/8
Q24:
At a certain company, each employee has a salary grade s that is at least 1 and at most 5.
Each employee receives an hourly wage p, in dollars, determined by the formula
p = 9.50 + 0.25(s – 1). An employee with a salary grade of 5 receives how many
more dollars per hour than an employee with a salary grade of 1?
A. $0.50
B. $1.00
C. $1.25
D. $1.50
E. $1.75
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