很急请求帮忙。

kangkang

1. 说有一个sequence,48%facts equals orless than 14, ask you what is the median in this sequence?
A. 58%facts in this sequence equals or less than 15
B.39%facts equals or bigger than 16

A: d【确定】 想问一下是不是少了整数这个条件？

2。 Q:某东西的西的down payment is X dollars or 5% of the nce Y, whichever is greather, is X equal to Y*5% （1）10* x=Y （2）y＝200

A :A 【确定】不懂题意WHICHEVER是什么意思呢？

3。有3间客房，有两位侍应生分别送酒和点心，可以在3个时间段送，但每个时间段不能给一个客房既送酒又送点心，问有几种送法？

A:12【确认】
R: c3,1*c2,1*c2,1  不懂是为什么



4。1982年某日是星期一，1985年的同日问是星期几(其中84年是leap year)?  (星期五)

LEAP是多少天式子怎么列呢？

yulei69

A guest can not have wine and dessert at the same time. So waiter have to go to separate room at one time. Thus at the first time slot, there at 3 possibility (one of 3 room will not be served). At second time slot, the room not served last time must be served, thus there are two possibility this time ( one of two that served last time can be served again). At third round, only one choice left. So now the possobility of going to rooms are 2*3=6

For each room, either wine or desert can be choose first, so there are 2*2*2=8 posibilitys. Thus

The total possibility should be 6*8=48, otherwise, the statement of the problem must have something missed

tongxun

1、是。2、咱也看不明白，估计不是难题。3、3--3见方，2--两人，2---两时间段。
4、leap year是366天，用所有的天数除以7，得出余数，望后推。